Vintage Stereo amplifiers & Pre-amps RESTORED / REFURBISHED / FULLY SERVICED & tested with a warranty!

OUR SERVICED / RESTORED AMPS, PRE-AMPS, POWER AMPS AND INTEGRATED AMPS:
PRE / CONTROL AMPS:
**NEW LISTING 4/21/2022** (click on above thumbnails to enlarge photos) warranty REFURBISHED / FULLY SERVICED & WARRANTED DYNACO PAT-4 STEREO PRE-AMPLIFIER "FACTORY WIRED VERSION" #...0948 MADE IN THE USA! Circa 1967-73 for sale Our technician has completely gone through and 'Certified' this unit cleaning contacts, controls and pots. Pots and switches are all super high quality. All functions tested perfectly. All original knobs intact and no bent control shafts. __________________________________ One of the classic, "old standby's" of the audio world. The Dynaco PAT-4 Pre-Amp. Brushed aluminum face with matching "milled" look knobs. This is also a VERY WELL DESIGNED & BUILT unit: Dynaco Pat-4 features: - Separate L & R, Bass and Treble - Stereo-Mono switches to provide A or B channels independently or combined (A+B) with 6 dB blend for 3rd channel output - L / R Balance - Tape Monitor input as well as Tape Head input for earlier tape decks (can also be used for Video / CD / DVD / VCR / DAT / MP3 / XM / SIRIUS etc. as well as for CDR) - Phono input - Tuner input (can also be used for Video / CD / DVD / VCR / DAT / MP3 / XM / SIRIUS etc. as well as for CDR) - High filter switch @ 15 KHz, 10 KHz, and 7 KHz - Low Filter selector - SPARE (AUX) input for (CD / DVD /DAT / iPod / VCR / MP3 / XM / SIRIUS etc. inputs) - RCA outputs for feeding power amp - 4 AC convenience outlets on rear panel (2 switched and 2 un-switched) Dynaco Pat-4 Original Specs: Frequency Response: High level inputs - �0.5 dB from 10 Hz to 100 KHz, Low level inputs - �1 dB from 20 Hz to 20 KHz Distortion at rated 2 volt output: THD less than 0.05% 20 Hz to 20 KHz IM less than 0.05% with any combination of test frequencies Hum and Noise: Magnetic Phono: 70 dB below a 10 mV reference signal High level: 85 dB below a 0.5 volt signal Gain: Magnetic Phono: 54 dB at 1000 Hz High Level: 20 dB Tone Control Range: �16 dB at 50 Hz �12 dB at 10 KHz Maximum Output: 10 volts into high impedance; 5 volts into 600 Ω . Impedances: Magnetic Phono: 47,000 Ω Tape Head: 100,000 Ω High level: 100,000 Ω Audio Output: 600 Ω To Tape: From low level inputs, 600 Ω . From high level inputs, same as source Amplifier input: Nominal load 10,000 Ω or higher Inputs: Low level or high level RIAA magnetic phono or ceramic phono NAB 7-1/2" tape head Special (normally microphone) Tape amplifier, Tuner, Spare high level, or TV, etc. Front panel high level Outputs: Tape input ahead of controls; 2 Audio outputs (one switched by front panel jack) This was from Dynaco's first series of solid-state audio components. Again, we have completely gone through the unit. One note about Dynaco Pat-4 pre amps is that, like a few other 'vintage' units, is due to the close proximity of the input jacks, you will need to utilize fairly 'normal' jacketed RCA connectors, as there is not enough room to 'squeeze' some of the 'fatter' RCA jacks (usually seen on 'high end' 'interconnects'). Following the above listed service, functions have been tested and pass with flying colors! Cosmetically, about the only other issue is that the face panel has most of the word "POWER" for the 'On-Off' switch, that was silk-screened on it rubbed off. Pre-amp looks decent and sounds great. Includes an 'e-copy' pdf download of the Dynaco PAT-4 owners / users / instruction manual. Unit measures 13.5" wide x 9" deep x 4.5" high and weighs ~4 lbs unpacked. Includes our standard 30 day limited warranty. Cond. 8.5++ $389. (C) R.R. (Above text, in it's entirety, property of www.oaktreevintage.com / Oak Tree Enterprises, LLC. See 'Copyright Information' page for details)			NEW ADDITION *12/20/2023* (click on above thumbnails to enlarge photos) warranty REFURBISHED / FULLY SERVICED & WARRANTED KENWOOD STEREO PRE AMPLIFIER AMP KC-207 / KC207 WITH GRAPHIC EQ #...0346 Circa early '90's for sale We have completely gone through this unit, cleaning inside and out including all contacts, switches and controls. Unit looks like NEW! All functions tested for perfect operation. All inputs tested and both side produces clean and even sine waves! No power supply hum of any kind. It's dead silent! Also, check the specs on this pre-amp against other Kenwood models. It's TEN times less THD with 30 more max mV input allowance than the last one we had!!! Rest of the specs are equally impressive. Versatile, and modern Kenwood KC-207 Pre-amp / Graphic EQ / control center. Features include: - Super quality control amplifier - 7-Band, Digitally controlled, Graphic EQ w/ 5 memory presets - 7 frequency centers are as follows: 60Hz - 150Hz - 400Hz - 1kHz - 2.4kHz - 6kHz & 15kHz with �12 dB (most do only 10 dB) - "EQ Record" function allows EQ curve to be imprinted to tape / recording - Full Fluorescent readout for unit status, including 7 band Spectrum Analyzer - Tuner Input (may also be used for Video / CD / DVD / VCR / DAT / iPod / MP3 / XM / SIRUS etc.) - Phono / Turntable input - CD Input (may also be used for Video / CD / DVD / VCR / DAT / iPod / MP3 / XM / SIRUS etc.) - "CD Direct" allows purest tone of CD through electronics. Also allows you to listen to your CD's while you record other sources to tape, etc. - 2 Video / AUX Inputs (may also be used for CD / DVD / VCR / DAT / iPod / MP3 / XM / SIRUS etc.) - Dual Tape monitors with Bi-Directional dubbing (Tape Monitors can be used with Tape decks such as Cassette Tape Recorders/ Players, Reel to Reel's, 8-Track Tape Cartridge Decks, Video / CD / DVD / VCR / DAT / MP3 / iPod� / iPad� / iPhone� / iTouch� / iGadget / MP3 / XM� / SIRUS� CDR (CD recorders) (Tape 2 on this unit can also serve as a Signal Processor / EQ / Surround Sound processor access point / loop) - Loudness selector (+8dB @ 100Hz (@-30dB volume level) - One switched AC convenience outlet on rear panel with a capacity of 680 watts of accessories - Kenwood "XS" System Control jacks for use with other compatible Kenwood "XS" gear - Remote Wireless capable with either a universal type remote or Kenwood's RC-70 (not included, nor available from us.) Specs: *Design type:* 2 Channels Input Sensitivities: Phono - 2.5mV / 47KΩ All other inputs = 150mV / 33KΩ *S/N: 79dB for Phono w/ 2.5mV or 85 dB w/ 5.0 mV input and 103dB for all other inputs* Phono Max input level: 130mV, THD 0.03% @ 1kHz Phono Frequency Response: 20-20kHz RIAA Standard Curve �3dB Line Input Frequency Response: 10-70kHz, -3dB Output: Tape Rec; 150mV/ 330Ω *Pre Out; 1000mV/ 330Ω* THD: 0.004% at full rated output w/ 20-20kHz / 0.003% @ 1kHz Loudness: +8dB @ 100Hz (@-30dB volume level) Again, we have completely gone through it cleaning all pots, contacts and switches and all functions test perfectly. Great control / pre-amplifier for just about any stereo system / power amp. Unit looks NEW and sounds great! Comes with a copy of the owners / users manual. Unit measures 16.5" wide x 3.25" tall x 11" deep and weighs 7 lbs unpacked. Comes with a copy of user manual and includes our standard 30 day limited warranty. KENWOOD KC-207 Cond. 9.5 $249. (Above text, in it's entirety, property of www.oaktreevintage.com / Oak Tree Enterprises, LLC. See 'Copyright Information' page for details)

POWER AMPS:
*NEW LISTING 8/16/2022* (Click on above thumbnails to enlarge photos) warranty REFURBISHED / FULLY SERVICED & WARRANTED PRE-APPRECIATED KENWOOD POWER AMPLIFIER KENWOOD BASIC M2A POWER AMP WITH "SIGMA DRIVE"* 1200+ WATT MONSTER!!! #...0981 Circa 1985-90 "WORLD AC POWER" � MIJ SOLD 2/26/2024 SHIPPING TO STANLEY IN NEVADA � Our technician has completely gone through and 'Certified' this unit. � Unit bench checked / tested. � Amp has been cleaned inside and out. � Face removed, meter illumination lens removed, cleaned and reattached. � Bias adjusted to proper 13mVDC per SM. � DC Offset able to be adjusted all the way down to 0 (ZERO) VDC!** � All functions have been tested and pass with flying colors! Amp designed using Huge Power Supply Transformers and oversized, vertical finned heat sink for very efficient and quiet, fan induction cooling of output devices. All inputs tested and both side produces clean and even sine waves! No power supply hum of any kind. It's dead silent! Following restoration procedures, we burned it in, in the shop at continuous volume for 48 hours straight and it functioned flawlessly. While this amp is originally rated at 220 Watts with both channels driven, on our test bench, this particular unit's (#...0981) amplifiers produced 46 Volts at 8 Ohms per channel for 260 Watts / channel and 40 Volts at 4 Ohms per channel for 400 Watts / channel via discrete output devices (Sanken 2x DAT1018N & 2x DAT1018P & 2x DAT1521N & 2x DAT1521P {8 total} ). (Idle AC current draw @ .5A. Floor noise measured at L= 00.0mVAC and R=00.0mVAC / -74dB) Great, later model, and BIG WATTAGE power amp by Kenwood. Model 'Basic M2A'. HUGE power output! Excellent for 2-channel (stereo) audio listening in a medium-large to larger stereo system, or for use in an A/V system. Lots of punch and headroom. Cosmetically it's in great condition with just a few light scratches on the upper corners of the face (see photos above). Kenwood BASIC M2A Features: - True DUAL power supplies (yes, TWO HUGE, copper shielded transformers inside) - SIGMA-TYPE B DRIVE amplifier. (Hey, it's complicated but is what accounts for the specs listed below. Here's a link to a very 'read'ie and technical' pdf you can digest at your leisure:* http://www.cieri.net/Documenti/Kenwood/Documenti%20tecnici/Kenwood%20-%20Sigma-Drive%20Technical%20Guide.pdf - Old Skoool Class A/B amplifier design - 2- Channel stereo operation - Off or A or B or A+B speaker selector via high current relay - Dual, Vertical, Multi-Segment LED Power Output Meters featuring Peak Hold with selectable "Hold Time" - Built-in, INDEPENDENT Protection circuit relays for each, separate channel - Large current resistors in the power amp section - LED Status indicators - Front-mounted 1/4" stereo headphone jack - RCA input jacks - Fan / Induction cooling (quiet though) - Dual, vertical finned internal heat sink - 3 Rear-mounted AC convenience outlets (2 switched for a total of 100 Watts and 1 un-switched @ 400 Watts for a total capacity of 500 Watts) (not included in the total power consumption spec) - True "WORLD AC POWER" 50 / 60 cycles and 110V, 120V, 220V & 240V AC current Kenwood BASIC M2A Original Specs: "220 Watts per channel minimum RMS, both channels driven @ 8ohms, 20-20k, with no more than 0.004% THD" Design type: 2 Channels, AB operation w/ "Sigma Drive" Slew Rate: 100 Volts / μsec (that's pretty darn fast) (based on previous model "M2") Rise Time: 100 Volts / 1.6μsec (and that's pretty darn quick) (based on previous model "M2") Damping Factor: 1000 @ 50Hz / 8 ohms (I've never heard of a "damping factor" that high, but I double checked the specs listed in both the OM and SM. A damping factor that high and it's VERY high 'Slew Rate', and fast "Rise Time" makes for some seriously 'tight' bass!!!...still not quite believing it. I sold pro audio amps for years, and I don't remember any of them coming close to that) Signal / Noise: 120dB A weighted (about as good as it can get!) Rated RMS Output: 220 Watts per channel, min. RMS, @ 8Ω, both channels driven, from 20Hz to 20kHz. Output at initial clip: 256 Watts per channel @ 8Ω or 385 Watts per channel @ 4Ω, both channels driven, from 20Hz to 20kHz. Dynamic (Music) Power; 616 Watts + 616 Watts @ 2Ω THD:* 0.004% at 'Full Rated Output' / 8Ω w/ 20-20kHz 0.004% @ half rated power / 8Ω w/ 20-20kHz (based on previous model "M2") 0.001% @ half rated power / 8Ω w/ 1kHz (based on previous model "M2") IMD: 0.004% @ rated power / 8Ω Potential Frequency Response: "DC"-300kHz +0dB / -3dB Input Sensitivity: 1V / 47KOhms Potential Power Consumption: 500 Watts (not sure how it could be that efficient, but there it is, obviously not including the AC convenience outlets calculated into this figure) Again, as stated before, our technician has completely refurb'd this Kenwood Basic M2A, stereo Power-Amp, cleaning and testing all and it gets our full 'Certification'. Great 'all around' power amp for about any audio system. We have sold MANY of this series of Kenwood power amps over the past 2+ decades, with never a complaint. Again, other than a few light scratches on the upper corners of the face, it's in great condition (see photos above). If you're looking for about as much REAL power in a home audio amp that you can get, this is one of the top candidates. Includes an 'e-copy' pdf download of the Kenwood Basic M2A owners / users / instruction manual. Unit looks, works and sounds great! Unit measures 17.25" wide x 14.75" deep x 7.25" high and weighs a heavy 34+ lbs unpacked. Includes our standard 30 day limited warranty. KENWOOD BASIC M2A Cond. 8.5++ SOLD 2/26/2024 SHIPPING TO STANLEY IN NEVADA (C) M.S. (Above text, in it's entirety, property of www.oaktreevintage.com / Oak Tree Enterprises, LLC. See 'Copyright Information' page for details)			*NEW LISTING 9/1/2022* (Click on above thumbnails to enlarge photos) warranty REFURBISHED / FULLY SERVICED & WARRANTED PRE-APPRECIATED KENWOOD POWER AMPLIFIER KENWOOD BASIC M1D POWER AMP 480 WATT MONSTER!!! #...0306 Circa 1988-90 "WORLD AC POWER" �* MIJ for sale � Our technician has completely gone through and 'Certified' this unit. � Unit bench checked / tested. � Amp has been cleaned inside and out. � Face removed, meter illumination lens removed, cleaned and reattached. � Bias adjusted to proper 15mVDC per SM. � DC Offset adjusted to less than 13mVDC L & R. � All functions have been tested and pass with flying colors! Amp designed using Huge Power Supply Transformers and oversized, vertical finned heat sink for passive, but very efficient cooling of output devices. All inputs tested and both side produces clean and even sine waves! No power supply hum of any kind. It's dead silent! Following restoration procedures, we burned it in, in the shop at continuous volume for 48 hours straight and it functioned flawlessly. While this amp is originally rated at 125 WPC, 20-20kHz with both channels driven, on our test bench, this particular unit's (#...0306) amplifiers individually, @ 1kHz produced 36 Volts at 8 Ohms per channel for 162 Watts / channel and 30 Volts at 4 Ohms per channel for 225 Watts / channel via discrete output devices (Sanken 2x 2SA1216 & 2x 2SC2922). (Idle AC current draw @ .37A. Floor noise measured at L= 00.0mVAC and R=00.0mVAC / -74dB) Great, later model, and BIG WATTAGE power amp by Kenwood. Model 'Basic M1D '. HUGE power output! Excellent for 2-channel (stereo) audio listening in a medium-large to larger stereo system, or for use in an A/V system. Lots of punch and headroom. Kenwood BASIC M1D Features: - Old Skoool Class A/B amplifier design - 2- Channel stereo operation - Off or A or B or A+B speaker selector via high current relay - Dual, Vertical, Multi-Segment LED Power Output Meters w/ dual range selector - RCA input jacks - Vertical finned internal heat sink - True "WORLD AC POWER" 50 / 60 cycles and 110V, 120V, 220V & 240V AC current Kenwood BASIC M1D Original Specs: "125 Watts per channel minimum RMS, both channels driven @ 8ohms, 20-20k, with no more than 0.008% THD" Design type: 2 Channels, A/B operation Damping Factor: 1000 @ 50Hz / 8 ohms (I've never heard of a "damping factor" that high, but I double checked the specs listed in both the OM and SM. A damping factor that high makes for some seriously 'tight' bass!!!...still not quite believing it. I sold pro audio amps for years, and I don't remember any of them coming close to that) Signal / Noise: 120dB A weighted (about as good as it can get!) Dynamic (Music) Power; 240 Watts + 240 Watts @ 4Ω THD:* 0.008% at 'Full Rated Output' / 8Ω w/ 20-20kHz Power Bandwidth: 10Hz-75kHz +0dB / -3dB @ 0.08% THD Input Sensitivity: 1V / 47KOhms Potential Power Consumption: 270 Watts (not sure how it could be that efficient, but there it is according the the rear of the unit) Again, as stated before, our technician has completely refurb'd this Kenwood Basic M1D, stereo Power-Amp, cleaning and testing all and it gets our full 'Certification'. Great 'all around' power amp for about any audio system. We have sold MANY of this series of Kenwood power amps over the past 2+ decades, with never a complaint. If you're looking for a decent amount of REAL power in a home audio amp that you can get, this is one of the top candidates. Includes an 'e-copy' pdf download of the Kenwood Basic M1D owners / users / instruction manual. Unit looks, works and sounds great! Unit measures 17.25" wide x 13.25" deep x 5.25" high and weighs a heavy 22 lbs unpacked. Includes our standard 30 day limited warranty. KENWOOD BASIC M1D Cond. 8.5++ $499. (C) M.S. (Above text, in it's entirety, property of www.oaktreevintage.com / Oak Tree Enterprises, LLC. See 'Copyright Information' page for details)
*NEW LISTING 4/15/20* (Click on above thumbnails to enlarge photos) warranty REFURBISHED / FULLY SERVICED & WARRANTED VINTAGE DYNACO STEREO POWER AMPLIFIER DYNACO "STEREO 150" POWER AMP DC OFFSET ADJUSTED TO SUPER LOW LEVEL OUTPUT BIAS SET TO SPEC #...1155 Circa 1974-79 MADE IN U.S.A. for sale Our technician has completely gone through and 'Certified' this unit. Output transistor removed and tested independently. Both original pilot lamps in working cond. Fuses (mains and 'speaker protection') checked for correct values. All functions have been tested and pass with flying colors! Both inputs tested and both side produces clean and even sine waves! No power supply hum of any kind. It's dead silent! This is one of the most 'famous' power amplifiers ever designed and sold. Originally co-designed by David Hafler (always been a favorite amp engineer of mine). On our test bench, this particular Dynaco Stereo-150, #...1155's amplifiers produced 27.5+ Volts at 8 Ohms per channel for 94+ Watts / channel and 23.5+Volts at 6 Ohms per channel for 138 Watts / channel via discrete, metal cased, TO-3 output transistors. (Idle AC current draw @ 0.5A. DC less <2mVDC / Ch (under 8 Ohm load). Bias adjusted to 75mVDC. Floor noise measured at L& R = > -60dBm Dynaco amps have always been known for understated appearance and performance. This was the replacement for the uber famous, "ST-120" power amp. A bit more 'conventional' in appearance and packaging, with an 'up' in power output. Excellent for 2-channel (stereo) audio listening or for use in an A/V system or for driving project studio monitors. From the original manual, "The Stereo 150 has been designed as two independent 75 watts (at 8 ohms) amplifying channels with a common power supply having a high degree of inherent regulation. In addition, where higher powers or higher volt-amp capabilities are required for lower load impedances, easy internal re-strapping permits monophonic operation for 150 watts output (at 8 ohms)." DYNACO STEREO-150 Features: - 2-Channel stereo, Class A/B operation - Discrete output transistors - Huge, externally located, vertical heat sinks - Standard RCA input jacks - Oversize power supply transformer and capacitors - 2-Way, Binding post / Banana speaker jacks - Externally located Speaker / Output protection fuses - Internally located AC / MAINS fuse DYNACO STEREO-150 Original Specs: Design type: 2 Channels, AB operation Rated RMS Output Stereo 20-20,000Hz: 100 Watts per channel, min. RMS, @ 4Ω 75 Watts per channel, min. RMS, @ 8Ω Rated RMS Output Bridged Mono 20-20,000Hz: 150 Watts per channel, min. RMS, @ 8Ω Damping Factor: @ 1kHz / 8Ω: >80 @ 50Hz-10kHz / 8Ω: >50 Signal / Noise: >95dB @ 75Watts THD; <0.25% @ rated power / 8Ω IMD; <0.25% @ rated power / 8Ω Input Sensitivity: 1.0V for 75 Watts output Input Impedance: 35k Ohms Channel Separation: >70dB @ 20Hz-20kHz Freq response: 10Hz-40kHz @ 8Ω Max Power consumption: 600 Watts Again, our senior tech has completely gone thru this Dynaco Stereo-150 and it gets our full 'Certification'. Cosmetically it has a few 'battle scars', but nothing too distracting (see photos above). Only 'performance' issue to be aware of is that Dynaco amps do not have 'relays' to block 'turn On / Off' thumps / sounds, so at turn-on you will hear a bit of 'electronic noise' as the circuits come to life, but nothing that is destructive. Unit looks, works and sounds great! Again, while not much on cosmetics or 'button features / whistles or bells' Dynaco amps are known for incredible punch, headroom, and musicality. Includes an 'e-copy' pdf download of the Dynaco Stereo 150 owners / users / instruction / assembly / service manual (which is actually an 'amazing read' and should probably be read by anyone using / owning ANY amplifier from ANY brand and ANY model! Just FYI). Unit measures 14.5" wide x 13.75" deep x 6.75" high and weighs ~26 lbs unpacked. Includes our 30 day limited warranty. DYNACO STEREO 150, 2-CHANNEL POWER AMP Cond. 8.5 $489. (C) R.R. (Above text, in it's entirety, property of www.oaktreevintage.com / Oak Tree Enterprises, LLC. See 'Copyright Information' page for details)	*NEW* *LISTING* *6/17/19* (Click on above thumbnails to enlarge photos) warranty REFURBISHED / FULLY SERVICED & WARRANTED VINTAGE DYNACO STEREO POWER AMPLIFIER DYNACO "STEREO 120" POWER AMP #...2874 Circa 1969-78 MADE IN U.S.A. SOLD 3/18/2024 SHIPPING TO RON IN NEW JERSEY Our technician has completely gone through and 'Certified' this unit. Output transistor removed and tested independently. Multiple Electrolytic Caps replaced. The balance tested and passed. Unit bench checked / tested. Output transistors 'Beta Matched'. All functions have been tested and pass with flying colors! Both inputs tested and both side produces clean and even sine waves! No power supply hum of any kind. It's dead silent! Total tech time invested ~7 hours. This is one of the most 'famous' power amplifiers ever designed and sold. Originally co-designed by David Hafler (always been a favorite amp engineer of mine), they have been the 'heart' of many audio systems since the late '60's. On our test bench, this particular Dynaco Stereo-120, #...2874's amplifiers produced 23 Volts at 8 Ohms per channel for 66 Watts / channel and 18 Volts at 6 Ohms per channel for 81 Watts / channel via discrete, metal cased, TO-3 output transistors. (Idle AC current draw @ 0.5A. DC less <3mVDC / Ch (under 8 Ohm load). Floor noise measured at L& R = 2.3mVAC) Dynaco amps have always been known for understated appearance and performance. While they were never much on looks or 'whistles and bells', they made up for that in performance. Excellent for 2-channel (stereo) audio listening or for use in an A/V system or for driving project studio monitors. DYNACO STEREO-120 Features: - 2-Channel stereo, Class A/B operation - Standard RCA input jacks - Oversize power supply transformer and capacitors - 3-Way, Binding post speaker jacks - AC / MAINS protection fuse DYNACO STEREO-120 Original Specs: Design type: 2 Channels, AB operation Damping Factor @ 20Hz-20kHz / 8Ω: >40 Signal / Noise: >100dB @ 60 Watts Input Sensitivity: 1.5V for 60 Watts output Input Impedance: 100k Ohms Channel Separation: >70dB @ 20Hz-20kHz Rated RMS Output Stereo: 60 Watts per channel, min. RMS, @ 8Ω IMD; <0.5% @ rated power / 8Ω Freq response: 5Hz-100kHz @ 8Ω Wall AC current needed: 400 Watts Again, our senior tech has completely gone thru this Dynaco Stereo-120 and it gets our full 'Certification'. Nickel / chrome plating is in great shape with none of the typical surface pitting / corrosion / rust. Perforated, top cover also rust and dent free. Unit looks, works and sounds great! Again, while not much on cosmetics or 'button features / whistles or bells' Dynaco amps are known for incredible punch, headroom, and musicality. Includes an 'e-copy' pdf download of the Dynaco Stereo 120 owners / users / instruction / assembly / service manual (which is actually an 'amazing read' and should probably be read by anyone using / owning ANY amplifier from ANY brand and ANY model! Just FYI). Unit measures 10.5" wide x 13" deep x 4" high and weighs 20 lbs unpacked. Includes our 30 day limited warranty. DYNACO STEREO 120, 2-CHANNEL STEREO POWER AMP Cond. 8.5 (C) R.R. SOLD 3/18/2024 SHIPPING TO RON IN NEW JERSEY (Above text, in it's entirety, property of www.oaktreevintage.com / Oak Tree Enterprises, LLC. See 'Copyright Information' page for details)				*NEW LISTING* *8/24/12* (Click on above thumbnails to enlarge photos) warranty B&K MULTI-CHANNEL AV2500 5-CHANNEL AUDIO / VIDEO POWER AMPLIFIER #...4826 Circa 1995 "WORLD AC POWER" � MADE IN USA for sale We have complete gone through this unit and bench checked / tested it. Amp has been cleaned inside and out. All input level pots cleaned for static free performance. Internals inspected, transformer secondary's tested and our technician has completely Certified this amp. All functions have been tested and pass with flying colors! Amp designed using Huge 'Torroidal' Power Supply Transformer. Super quality all around. From the original OM, "The high quality parts complement include state-of-the-art solid state devices, 1% metal film resistors, computer grade electrolytic power supply capacitors, and a high capacity toroidal transformer". All 5 inputs and all 5 outputs tested and both side produces clean and even sine waves! No power supply hum of any kind. It's dead silent! Following restoration procedures, we burned it in, in the shop at continuous high volume for 4 hours straight and it functioned flawlessly. On our test bench, each of this particular unit's (#...4826) FIVE (5) amplifiers produced 21.2 Volts at 8 Ohms per channel for 56 Watts / channel and 17.7 Volts at 4 Ohms per channel for 78 Watts / channel (4 Ohm operation not recommended) via discrete output transistors (5x LM3886T. (Idle AC current draw @ .38A. DC offset / out <2mV each channel. Great condition, late model, 5-Channel power amp by B&K. Model B&K AV2500. VERY versatile unit. 5-inputs and 5 outputs, Stereo and Mono Line outputs, bridge-able and more. Excellent for feeding multiple rooms / speaker systems or for use in an A/V system. Lots of punch and headroom. Features: - 5- Channel operation - 5 Discrete inputs and 5 Discrete outputs - 'Bridge-able' into ONE big power amp - Built-in Protection circuit - LED Status indicators - RCA input jacks - Oversize torroidal power supply transformer - Heavy duty binding posts (can use 'single' bananas, but not standard banana pair spacing) - Gold Plated Connectors - Improve connections for better sound and minimized signal loss and degradation. - 1% Metal Film Resistors - Low noise resistors for better sound and a greater degree of repeatability. - High Current - Ability to reproduce demanding recordings. - Computer Grade Capacitors - Large capacity computer grade electrolytic capacitors for extended low frequency control and improved dynamics. - Protection from accidental shorting of output devices and protection from thermal overload. - Externally located 'mains' fuse - 5-24VDC Control input voltage and 12VDC control voltage output (comes with 'shorting' cable to enable amp function without any corresponding control voltage in.) - True "WORLD AC POWER"� allows unit to be operated on 50 or 60 Hz AC and will select voltages from 110v, 120v, 220v and 240 Volts AC input. Also from the OM: "The most obvious function for the AV2500 series II is to take five separate audio inputs and provide five separate amplified outputs. Your AV2500 series II has arrived set up in this configuration. - With the inputs buffered, a line output (OUT BUS) may be taken from either the L BUS, R BUS, or L+R BUS and sent on to another amplifier. This allows for linking of multiple amplifiers. - Continuing its versatility, the AV2500 series II may be used mono to provide one, high current channel in order to drive a speaker requiring more power. - As a result of the AV2500 series II�s unique bus system, the input to channels 4 and 5 may be inverted thereby allowing the possibility of creating a single high voltage (bridged) channel from one source, through the left bus." Many more features, listed in the user manual, way too numerous to mention. Original B&K AV2500 Specifications (2500II specs, but essentially the same amp): "60 Watts per channel minimum RMS, @ 8Ohms, 1k, with no more than 0.09% THD" Design type: 5 Channels, Class-A/B operation Input Sensitivity: 0.77V Input impedance: 33.2k Ohms THD: 0.09% @ 1kHz Power Bandwidth: 5Hz-45kHz Slew Rate: 14V / mSec Damping Factor: 80 / 8 Ohms Signal / Noise: 95dB A weighted Dynamic Headroom: 1dB Max Power Consumption: 450 Watts Again, as stated before, our technician has completely gone thru this B&K AV2500, multi-channel Power-Amp, cleaning and testing all and it gets our full 'Certification'. Overall amp in great cosmetic condition, with only minor wear to the top cover. Unit looks, works and sounds great! Includes a pdf 'e' copy of the B&K AV2500 owners / users manual. Unit measures 17" wide x 12" deep x 3.75" high and weighs 23 lbs unpacked. Includes our standard 30 day limited warranty. B&K AV2500 MULTI-CHANNEL POWER AMPLIFIER Cond. 8.5 $399. (Above text, in it's entirety, property of www.oaktreevintage.com / Oak Tree Enterprises, LLC. See 'Copyright Information' page for details)
*NEW LISTING 8/24/2021* (click on above thumbnails to enlarge photos) warranty FULLY SERVICED / BENCH TESTED ADCOM STEREO POWER AMPLIFIER ADCOM GFA-5300 MOSFET OUTPUTS #...3427 Circa 1997 SOLD 7/32/2023 SHIPPING TO ALEX IN MICHIGAN � Our technician has completely gone through and 'Certified' this unit cleaning all. � Amp has been cleaned inside and out. � Internal fuses checked for correct values and function � Bias and DC offset set correctly (DC offset was actually able to be set to ZERO on both L & R!) � All functions have been tested and pass with flying colors! Amp designed using Huge, Toroidal Power Supply Transformer, Dual power supply and super quality (expensive) filter caps. Huge, vertically finned heat sink for very efficient and silent, passive cooling of output devices (all amps / receivers should be designed this way). This amplifier is in both great electronic and physical shape. Looks LIKE NEW and sounds fantastic! All inputs tested and both side produces clean and even sine waves! No power supply hum of any kind. It's dead silent! Following restoration procedures, we burned it in, in the shop at continuous high volume for 8 hours straight and it functioned flawlessly. Technician's note: "VERY good build quality" On our test bench, this unit's (#...13427) amplifiers produced 30 Volts at 8 Ohms per channel for 112 Watts / channel and 27 Volts at 4 Ohms per channel for 182 Watts / channel via discrete, Mosfet output transistors; 4x IRFP240 & 4x IRFP9240 (DC offset adjusted to 0mV (as in "ZERO" per channel!!!). Floor noise >-60dBm. Idle AC current draw @ .550A) Great "general purpose" power amp for a variety of consumer and Pro-Audio applications. Super quiet operation and build quality. We run this amp in our main demo system and have for a few weeks now and Love it!!! Great for full range stereo speakers, Studio Monitors, home audio, practice PA etc. For you 'tech-savvy' types, here's an excerpt from the original manual regarding amp design: "Low number of gain stages improves signal reproduction accuracy"..."Custom toroidal power transformer provides better regulation and greater peak current capability"..."Large, internal heatsinks for greater cooling capability of output devices". The final output stage uses multiple lateral, Precision Matched, MOSFET�s (Metal Oxide Semiconductor Field Effect Transistors): four devices per channel in the GFA-5300. These devices, unlike conventional bipolar transistors, have a negative temperature coefficient, which means that they do not exhibit �thermal runaway�. Thermal runaway is a phenomenon whereby a transistor heats up as it conducts more current, which causes it to get hotter, and conduct more current, and so on, until the device self-destructs. Since MOSFET�s are inherently self-protecting, no sonically degrading, complex circuitry is required to monitor and protect the output devices. Furthermore, these lateral MOSFET�s exhibit a very linear input to output transfer function. Their connection in circuits and operating characteristics are very similar to vacuum tubes, which is perhaps responsible for their widely recognized sonic trait of being very �musical� and non-fatiguing. ADCOM GFA-5300 FEATURES: 1)- Dual Power Supply 4)- Discrete, Precision Matched, MOSFET Output transistors 2)- 40,000 μF of power supply filter capacitance with low ESR 8)- Custom toroidal power transformer - Two Channel, Class A-B architecture 3)- Very Large internal heatsinks to keep the outputs cool with matching bottom and top plate louvers to facilitate air flow - Silicone output insulators instead of typical 'white paste' 1-8)- Super Quality internal construction methods 6)- Internally wired with heavy gauge wire 5)- All, proper, 'old-school' components inside. NO anemic, low current SMD parts! - 'Soft Turn-On / Turn-Off' protection against "turn-on / turn-off" transients - LED distortion detection indicators (Distortion Alert circuit is a unique Adcom system which reads all forms of non-linear distortion such as excessive THD, IM, Slew-induced, 'clipping' etc. The LED's will react when any type reaches 1%) - Thermal protection for amplifier w/ LED indicators 7)- Point to Point I/O jack wiring (not directly soldered to circuit boards avoids flexing solder joints) 7)- Gold Plated RCA input signal jacks 7)- Speaker outputs via 5-Way binding / banana posts Cosmetically it's in decent shape. There's a few tics / finish wear across the front edges, some scratches on the top and one side, but nothing distracting, especially when viewed from the front. Works and sounds great! We've actually been using this amp on our shop audio system following it's bench service for a couple months and it's performed flawlessly (in fact, once it sells, not sure what we're going to put in it's place that will test speakers so well). ADCOM GFA-5300 ORIGINAL SPECIFICATIONS / SPECS: Dynamic Headroom @ 4 Ohms: 2.1 dB Input Sensitivity (for 80 Watts @ 8 Ohms): 0.9 VRMS THD: 0.02% @ 1kHz Power Bandwidth: 3Hz to 130Hz S/N: >100dB @ 80 Watts @ 8Ω un-weighted Gain: 29dB Rise Time: 5kHz, 80V p-p w/ square wave, from 20-80% = 1.8 μsec Damping Factor: >350 to 1k / 8Ω & >200 to 10k / 8Ω Input Impedance: 49.9k ohms unbalanced Connectors (each channel): Input: Gold Plated RCA. Output: 5-way binding posts Cooling: Convection (Vertically mounted, heat sinks) Amplifier Protection: Full thermal Speaker Protection: 'Soft Turn-On / Turn-Off' Power Consumption: 100VA @ 'quiescent' and 720 VA at max output Rated Output Power (per channel): Continuous Average Output Power Both Channels Driven: 8 Ohms, 20Hz - 20kHz, 0.18% THD: 80 Watts 4 Ohms, 20Hz - 20kHz, 0.18% THD: 125 Watts Again, we have completely gone through the unit cleaning and testing all. On our test bench, both amplifiers produce perfectly clean and symmetrical sine waves at both 8 & 4 ohm loads. Includes an 'e-copy' pdf download of the Adcom GFA-5300 owners / users / instruction manual and the service manual if purchaser desires. Measures 17" wide x 12.5 deep x 4.5" tall and weighs 22 lbs unpacked. Includes our standard 30 day limited warranty. ADCOM GFA-5300 Cond. 8+ (Cons.) R.R. SOLD 7/32/2023 SHIPPING TO ALEX IN MICHIGAN (Above text, in it's entirety, property of www.oaktreevintage.com / Oak Tree Enterprises, LLC. See 'Copyright Information' page for details)
*NEW LISTING 9/13/2022* (Click on above thumbnails to enlarge photos) warranty REFURBISHED / FULLY SERVICED & WARRANTED VINTAGE DYNACO STEREO POWER AMPLIFIER DYNACO "STEREO 120" POWER AMP #...7923 Circa 1969-78 MADE IN U.S.A. for sale Our technician has completely gone through and 'Certified' this unit. Output transistor removed and tested independently. Multiple Electrolytic Caps checked for ESR, capacitance and leakage and passed. New, 3-Prong / Grounded AC cord installed (had previously been re-located to rear of unit (instead of the front position by design). Unit bench checked / tested. All functions have been tested and pass with flying colors! Both inputs tested and both side produces clean and even sine waves! No power supply hum of any kind. It's dead silent! Total tech time invested ~7.5 hours. This is one of the most 'famous' power amplifiers ever designed and sold. Originally co-designed by David Hafler (always been a favorite amp engineer of mine), they have been the 'heart' of many audio systems since the late '60's. On our test bench, this particular Dynaco Stereo-120, #...7923's amplifiers produced 21 Volts at 8 Ohms per channel for 55 Watts / channe via discrete, metal cased, TO-3 output transistors. While we did test this unit down to 4 Ohms, it is not particularly stable that low on a 'static load', but was fine at 6 Ohms. (Idle AC current draw @ 0.4A. DC less <3.5mVDC / Ch (under 8 Ohm load). Floor noise measured at L& R = ~2.0mVAC) Dynaco amps have always been known for understated appearance and performance. While they were never much on looks or 'whistles and bells', they made up for that in performance. Excellent for 2-channel (stereo) audio listening or for use in an A/V system or for driving project studio monitors. DYNACO STEREO-120 Features: - 2-Channel stereo, Class A/B operation - Standard RCA input jacks - Oversize power supply transformer and capacitors - 3-Way, Binding post speaker jacks - AC / MAINS protection fuse DYNACO STEREO-120 Original Specs: Design type: 2 Channels, AB operation Damping Factor @ 20Hz-20kHz / 8Ω: >40 Signal / Noise: >100dB @ 60 Watts Input Sensitivity: 1.5V for 60 Watts output Input Impedance: 100k Ohms Channel Separation: >70dB @ 20Hz-20kHz Rated RMS Output Stereo: 60 Watts per channel, min. RMS, @ 8Ω IMD; <0.5% @ rated power / 8Ω Freq response: 5Hz-100kHz @ 8Ω Wall AC current needed: 400 Watts Again, our senior tech has completely gone thru this Dynaco Stereo-120 and it gets our full 'Certification'. This power amp should be used with 6 Ohms or greater speaker load. While the Nickel / chrome plating does have a 'tarnished' look (that doesn't want to come off) it is in overall good shape with very little of the common, actual surface pitting / corrosion / rust. Perforated, top cover also rust and dent free. Unit looks, works and sounds great! Again, while not much on cosmetics or 'button features / whistles or bells' Dynaco amps are known for incredible punch, headroom, and musicality. Includes an 'e-copy' pdf download of the Dynaco Stereo 120 owners / users / instruction / assembly / service manual (which is actually an 'amazing read' and should probably be read by anyone using / owning ANY amplifier from ANY brand and ANY model! Just FYI). Unit measures 10.5" wide x 13" deep x 4" high and weighs 20 lbs unpacked. Includes our 30 day limited warranty. DYNACO STEREO 120, 2-CHANNEL STEREO POWER AMP Cond. 8 $349. (C) R.R. (Above text, in it's entirety, property of www.oaktreevintage.com / Oak Tree Enterprises, LLC. See 'Copyright Information' page for details)
*NEW* *LISTING* *9/21/2022* (Click on above thumbnails to enlarge photos) warranty SERVICED / BENCH TESTED RBH SA400 MONAURAL SUB-WOOFER POWER AMPLIFIER RBH SA-400 "WHEN THEY WERE STILL TRUE, CLASS A/B DESIGNED" ALSO, NO "SMD" COMPONENTS POPULATING THE CIRCUIT BOARDS #...0095 "WORLD AC POWER" � Circa 2001 for sale Our technician has completely gone through and 'Certified' this unit cleaning contacts, controls and pots. � Amp has been cleaned inside and out. � Mains checked for proper 115VAC position and fuse value � All inputs tested and both side produces clean and even sine waves! � All functions have been tested and pass with flying colors! � This amplifier is in both great electronic and physical shape. � No power supply hum of any kind. It's dead silent! � Following restoration procedures, we burned it in, in the shop at continuous high volume for 8 hours straight and it functioned flawlessly. Looks great and sounds fantastic! On our test bench, this unit's amplifiers produced 43.7 Volts at 8 Ohms per channel for 238+ Watts and 38.0 Volts at 4 Ohms per channel for 360+ Watts via discrete output transistors. (DC offset measured at outputs at 1.7mVDC. Floor noise measured at >-60dBm) Tech notes: "Good build quality...Lots of power supply filtering capacitance with 2x 6800uF / 80V and 2x 6800uF / 100V caps" Great "Subwoofer" power amp for a variety of consumer and Pro-Audio applications. Super quiet operation and build quality. Real Class-A/B architecture and discrete output transistors. If you�re thinking of adding subwoofer(s) to your audio system, a �SA Series� subwoofer amp by RBH, is not only one of the easiest ways, but also a great ROI from a performance standpoint. I am blown away by how well these work. I�ve tried them on numerous subs (including in my small-medium PA system). These amps have a lot of punch and guts! Very practical, versatile, and easy to control. Allows you to squeeze out every ounce of performance from your sub system. Numerous ways to connect, but feel free to call to find out if you can connect to your system, or what would be the best way to utilize it. This is a great subwoofer amp. I tested it extensively. Didn't actually know you could get something like this that wasn't a 'plate amp'. Actually thinking of keeping this one as an amp for my live music sub. RBH SA400 FEATURES: - REAL CLASS A/B Amp design - Discrete output transistors - Variable crossover from 40-180Hz - Line-Level or 'Speaker' level inputs - Line level pass through at 'Full-Range' (same as what came in) - Speaker Level pass through that has a built-in 'High-Pass' filter for everything above 100Hz!!! - "Boost" increases volume at 25Hz by 4dB (be careful when selecting this as "4dB" is more than a doubling of power output at those freqs!) - Phase infinitely variable from 0�-180� (one of the best features about the amp) - 'Stand-by' power mode with 'auto-detect' for audio signals (means that the amp can be left powered on, but goes into 'sleep' mode. When an audio signal is detected, it automatically powers up. Very handy as you don't have to worry about your 'Turn-On / Turn-Off' sequence) - Variable Input "Master Volume" Level control (front panel) - Vertically mounted heat sinks - Gold Plated RCA signal I/O's and Speaker posts - Speaker inputs and outputs via, heavy-duty, 3-Way binding / banana posts - Dimmer located on rear panel for somewhat over zealous 'front' LED's - External Mains protection fuse - True "WORLD AC POWER"� allows unit to be operated on 50 or 60 Hz AC and will select voltages from 110v, 120v, 220v and 240 Volts AC input. RBH SA-400 ORIGINAL SPECIFICATIONS / SPECS: System Type: Monaural Subwoofer Amplifier Amplifier Type: Discrete output, Class A/B Subwoofer Amplifier Power Output: Rated up to 400 Watts RMS @ 4 Ohms (within distortion parameters) via discrete output transistors Damping Factor: >200 (one of the main reasons these amps are so 'punchy') Distortion (THD): <.04% @ 1 Watt S/N Ratio: <82dB (Without Filter) Line Level Input Impedance: 45 Kohms Speaker Level Input Impedance: 200 Ohms Line Level Input Sensitivity: 80 mV Speaker Level Input Sensitivity: 2.8V Crossover Slope: 12dB/Octave Crossover Freq. Range: 40-180Hz �dB Auto Turn-on Sensitivity: 2 mV @ 50 Hz Frequency Response: 20Hz-40kHz �3dB (filter off) 15Hz-40kHz �3dB (boost on) Boost: 4dB @ 25Hz Damping Factor: >200 (one of the main reasons these amps are so 'punchy') On our test bench, the amp produce perfectly clean and symmetrical sine waves at both 8 & 4 Ohm loads. Includes an 'e-copy' pdf download of the RBH SA200 / SA400 Owners / users manual. Measures standard 19" Rack mount (with optional rack ears installed, but not included), or without rack ears; 17.75" wide x 14" deep x 4" tall and weighs 25 lbs unpacked. Includes our standard 30 day limited warranty. RBH SA400 Cond. 8.5+++ $499. (C) R.R. (Above text, in it's entirety, property of www.oaktreevintage.com / Oak Tree Enterprises, LLC. See 'Copyright Information' page for details)		*NEW* *LISTING* *9/21/2022* (Click on above thumbnails to enlarge photos) warranty SERVICED / BENCH TESTED RBH SA200 MONAURAL SUB-WOOFER POWER AMPLIFIER RBH SA-200 "WHEN THEY WERE STILL TRUE, CLASS A/B DESIGNED" ALSO, NO "SMD" COMPONENTS POPULATING THE CIRCUIT BOARDS #...1695 "WORLD AC POWER" � Circa 2001 SOLD 8/15/2023 SHIPPING TO DAVE IN NORTH CAROLINA Our technician has completely gone through and 'Certified' this unit cleaning contacts, controls and pots. � Amp has been cleaned inside and out. � Mains checked for proper 115VAC position and fuse value � All inputs tested and both side produces clean and even sine waves! � All functions have been tested and pass with flying colors! � This amplifier is in both great electronic and physical shape. � No power supply hum of any kind. It's dead silent! � Following restoration procedures, we burned it in, in the shop at continuous high volume for 8 hours straight and it functioned flawlessly. Looks great and sounds fantastic! On our test bench, this unit's amplifiers produced 33 Volts at 8 Ohms per channel for 136 Watts and 29 Volts at 4 Ohms per channel for 210 Watts via discrete output transistors. (DC offset measured at outputs at -4mVDC. Floor noise measured at >-60dBm) Tech notes: "Good build quality" Great "Subwoofer" power amp for a variety of consumer and Pro-Audio applications. Super quiet operation and build quality. Real Class-A/B architecture and discrete output transistors. If you�re thinking of adding subwoofer(s) to your audio system, a �SA Series� subwoofer amp by RBH, is not only one of the easiest ways, but also a great ROI from a performance standpoint. I am blown away by how well these work. I�ve tried them on numerous subs (including in my small-medium PA system). These amps have a lot of punch and guts! Very practical, versatile, and easy to control. Allows you to squeeze out every ounce of performance from your sub system. Numerous ways to connect, but feel free to call to find out if you can connect to your system, or what would be the best way to utilize it. This is a great subwoofer amp. I tested it extensively. Didn't actually know you could get something like this that wasn't a 'plate amp'. Actually thinking of keeping this one as an amp for my live music sub. RBH SA200 FEATURES: - REAL CLASS A/B Amp design - Discrete output transistors - Variable crossover from 40-180Hz - Line-Level or 'Speaker' level inputs - Line level pass through at 'Full-Range' (same as what came in) - Speaker Level pass through that has a built-in 'High-Pass' filter for everything above 100Hz!!! - "Boost" increases volume at 25Hz by 4dB (be careful when selecting this as "4dB" is more than a doubling of power output at those freqs!) - Phase selectable for either 0� or 180� - 'Stand-by' power mode with 'auto-detect' for audio signals (means that the amp can be left powered on, but goes into 'sleep' mode. When an audio signal is detected, it automatically powers up. Very handy as you don't have to worry about your 'Turn-On / Turn-Off' sequence) - Variable Input "Master Volume" Level control (front panel) - Vertically mounted heat sinks - Gold Plated RCA signal I/O's and Speaker posts - Speaker inputs and outputs via, heavy-duty, 3-Way binding / banana posts - Dimmer located on rear panel for somewhat over zealous 'front' LED's - External Mains protection fuse - True "WORLD AC POWER"� allows unit to be operated on 50 or 60 Hz AC and will select voltages from 110v, 120v, 220v and 240 Volts AC input. RBH SA-200 ORIGINAL SPECIFICATIONS / SPECS: System Type: Monaural Subwoofer Amplifier Amplifier Type: Discrete output, Class A/B Subwoofer Amplifier Power Output: Rated up to 200 Watts RMS @ 4 Ohms (within distortion parameters) via discrete output transistors Damping Factor: >200 (one of the main reasons these amps are so 'punchy') Distortion (THD): <.04% @ 1 Watt S/N Ratio: <82dB (Without Filter) Line Level Input Impedance: 45 Kohms Speaker Level Input Impedance: 200 Ohms Line Level Input Sensitivity: 80 mV Speaker Level Input Sensitivity: 2.8V Crossover Slope: 12dB/Octave Crossover Freq. Range: 40-180Hz �dB Auto Turn-on Sensitivity: 2 mV @ 50 Hz Frequency Response: 20Hz-40kHz �3dB (filter off) 15Hz-40kHz �3dB (boost on) Boost: 4dB @ 25Hz Damping Factor: >200 (one of the main reasons these amps are so 'punchy') On our test bench, the amp produce perfectly clean and symmetrical sine waves at both 8 & 4 Ohm loads. Includes an 'e-copy' pdf download of the RBH SA200 / SA-400 Owners / users manual. Measures standard 19" Rack mount (with optional rack ears installed, but not included), or without rack ears; 17.75" wide x 14" deep x 4" tall and weighs 17 lbs unpacked. Includes our standard 30 day limited warranty. RBH SA200 Cond. 8.5+++ (C) R.R. SOLD 8/15/2023 SHIPPING TO DAVE IN NORTH CAROLINA (Above text, in it's entirety, property of www.oaktreevintage.com / Oak Tree Enterprises, LLC. See 'Copyright Information' page for details)		*NEW* *LISTING* *9/21/2022* (Click on above thumbnails to enlarge photos) warranty SERVICED / BENCH TESTED RBH SA200 MONAURAL SUB-WOOFER POWER AMPLIFIER RBH SA-200 "WHEN THEY WERE STILL TRUE, CLASS A/B DESIGNED" ALSO, NO "SMD" COMPONENTS POPULATING THE CIRCUIT BOARDS #...1303 "WORLD AC POWER" � Circa 2001 for sale Our technician has completely gone through and 'Certified' this unit cleaning contacts, controls and pots. � Amp has been cleaned inside and out. � Mains checked for proper 115VAC position and fuse value � All inputs tested and both side produces clean and even sine waves! � All functions have been tested and pass with flying colors! � This amplifier is in both great electronic and physical shape. � No power supply hum of any kind. It's dead silent! � Following restoration procedures, we burned it in, in the shop at continuous high volume for 8 hours straight and it functioned flawlessly. Looks great and sounds fantastic! On our test bench, this unit's amplifiers produced 33 Volts at 8 Ohms per channel for 136 Watts and 28 Volts at 4 Ohms per channel for 196 Watts via discrete output transistors. (DC offset measured at outputs at 1.6mVDC. Floor noise measured at >-60dBm) Tech notes: "Good build quality" Great "Subwoofer" power amp for a variety of consumer and Pro-Audio applications. Super quiet operation and build quality. Real Class-A/B architecture and discrete output transistors. If you�re thinking of adding subwoofer(s) to your audio system, a �SA Series� subwoofer amp by RBH, is not only one of the easiest ways, but also a great ROI from a performance standpoint. I am blown away by how well these work. I�ve tried them on numerous subs (including in my small-medium PA system). These amps have a lot of punch and guts! Very practical, versatile, and easy to control. Allows you to squeeze out every ounce of performance from your sub system. Numerous ways to connect, but feel free to call to find out if you can connect to your system, or what would be the best way to utilize it. This is a great subwoofer amp. I tested it extensively. Didn't actually know you could get something like this that wasn't a 'plate amp'. Actually thinking of keeping this one as an amp for my live music sub. RBH SA200 FEATURES: - REAL CLASS A/B Amp design - Discrete output transistors - Variable crossover from 40-180Hz - Line-Level or 'Speaker' level inputs - Line level pass through at 'Full-Range' (same as what came in) - Speaker Level pass through that has a built-in 'High-Pass' filter for everything above 100Hz!!! - "Boost" increases volume at 25Hz by 4dB (be careful when selecting this as "4dB" is more than a doubling of power output at those freqs!) - Phase selectable for either 0� or 180� - 'Stand-by' power mode with 'auto-detect' for audio signals (means that the amp can be left powered on, but goes into 'sleep' mode. When an audio signal is detected, it automatically powers up. Very handy as you don't have to worry about your 'Turn-On / Turn-Off' sequence) - Variable Input "Master Volume" Level control (front panel) - Vertically mounted heat sinks - Gold Plated RCA signal I/O's and Speaker posts - Speaker inputs and outputs via, heavy-duty, 3-Way binding / banana posts - Dimmer located on rear panel for somewhat over zealous 'front' LED's - External Mains protection fuse - True "WORLD AC POWER"� allows unit to be operated on 50 or 60 Hz AC and will select voltages from 110v, 120v, 220v and 240 Volts AC input. RBH SA-200 ORIGINAL SPECIFICATIONS / SPECS: System Type: Monaural Subwoofer Amplifier Amplifier Type: Discrete output, Class A/B Subwoofer Amplifier Power Output: Rated up to 200 Watts RMS @ 4 Ohms (within distortion parameters) via discrete output transistors Damping Factor: >200 (one of the main reasons these amps are so 'punchy') Distortion (THD): <.04% @ 1 Watt S/N Ratio: <82dB (Without Filter) Line Level Input Impedance: 45 Kohms Speaker Level Input Impedance: 200 Ohms Line Level Input Sensitivity: 80 mV Speaker Level Input Sensitivity: 2.8V Crossover Slope: 12dB/Octave Crossover Freq. Range: 40-180Hz �dB Auto Turn-on Sensitivity: 2 mV @ 50 Hz Frequency Response: 20Hz-40kHz �3dB (filter off) 15Hz-40kHz �3dB (boost on) Boost: 4dB @ 25Hz On our test bench, the amp produce perfectly clean and symmetrical sine waves at both 8 & 4 Ohm loads. Includes an 'e-copy' pdf download of the RBH SA-200 / SA400 Owners / users manual. Measures standard 19" Rack mount (with optional rack ears installed, but not included), or without rack ears; 17.75" wide x 14" deep x 4" tall and weighs 17 lbs unpacked. Includes our standard 30 day limited warranty. RBH SA200 Cond. 8.5+++ $349. (C) R.R. (Above text, in it's entirety, property of www.oaktreevintage.com / Oak Tree Enterprises, LLC. See 'Copyright Information' page for details)
Did you know? THD (Total Harmonic Distortion) � THD is a measure of the how much a given audio device may distort a signal through the inevitable introduction of added harmonics or overtones. These figures are usually given as percentages. THD figures below approximately 1% are inaudible to most people (although market promotion efficiencies have 'brain-washed' much of the 'audio-public' into weighting low THD with almost 'holy grail' importance. I remember some manufacturers touting numbers as low as <0.003% in the early Eighties). Low THD is not always an indication of a high quality amplifier. In fact, it is / was more commonly just the opposite. Some of the 'highest end' (read REALLY expensive) and certainly best sounding units will have distortions somewhere between .1% & 1%. Low THD is only a simple 'bi-product' of 2 aspects. The first was an inordinate and increasing amount of 'global / negative feedback' built into amplifiers primarily to suppress distortion. This practice started to occur in the late 1970's and certainly was in 'full force' past the early 1980's for most 'main stream' consumer-grade audio amplifiers. Unfortunately this also 'suppressed' tone and 'punch' (musicality) but it made the numbers look good to the 'spoon fed' consumer (kind of like overly high speaker wattage numbers, and sorry if you're in that group and, most folks were so you're not alone). Secondly manufacturers were moving away from 'discrete-transistor' output designs to more 'monolithic' 'power-pack' output designs. While these designs reduced power supply requirements, thus reducing parts costs and weight (also translates to lower prices due to savings on freight from Asia) they generally sounded anywhere from somewhat 'anemic' compared with the designs from a few years previous, to completely 'gutless' and 'un-musical'. But, hey,� they had very low distortion figures�.Can anyone say 'threw the baby out with the bath water'? Excerpts of the above text from the website of one of the best Car Audio sites and stores in the world, 'Car-Fi' www.car-fi.com .
*NEW LISTING 4/17/2023 (Click on above thumbnails to enlarge photos)* WALNUT WOOD VENEER EQUIPMENT RACK / CASE 6U / 6-SPACE for sale This came in loaded with vintage Crown equipment. I could be from Crown, or could be from another mfg. It will, of course fit standard / 19" width rack gear from any company. Solidly built. Click here for link to page with full info....
INTEGRATED AMPS:
NEW ADDITION *8/20/19* (Click on above thumbnails to enlarge photos) warranty REFURBISHED / FULLY SERVICED & WARRANTED OLD-SCHOOL, 2-CHANNEL STEREO VINTAGE KENWOOD STEREO INTEGRATED AMPLIFIER KENWOOD KA-6004 / KA6004 BIG 'DYNAMIC' POWER AND LOADS OF INPUTS!!! #...1687 Circa 1973-76 *"WORLD AC POWER" �* MIJ SOLD 3/19/2024 SHIPPING TO JOSE IN CALIFORNIA � Our technician has completely gone through and 'Certified' this unit. � Everything was cleaned inside and out including all switches, controls and contacts. � Internal fuses checked for correct value / function and replaced where necessary (actually replaced a couple �incorrect� values). � Power switch was arching, so it was disassembled, and contacts burnished, re-lubed and re-assembled � Solder joints reflowed on Tone Control Circuit Board, and 'Filter Switch' circuit board, and the balance of all possible high heat and stress points � Amplifier section had output bias set to correct 40mA from existing (and erroneous) 60+mA. � DC offset set to < 10mVDC either channel from existing 25+mVDC � All functions tested for perfect operation. � Following above procedures, unit was cosmetically detailed inside and out. � Even though all Power and Function Indicator illumination lamps were in working condition, we replaced all; 6x #25-130 and 1x #1302 � All inputs tested and both sides produce clean and even sine waves into static 8 & 4 ohm loads! No power supply hum of any kind. It's dead silent! � Following restoration procedures, the unit was run continuously at medium volume, as all our amplifier / receivers are, into a load with "Loudness" on and both Tone Controls at 10 for 48 hours. Total tech time 13 hours. On our test bench, each internal amplifier of this particular unit, #...1687, produced peak power of 20+ Volts per channel at 8 ohms for 54+ Watts per channel and 17 Volts at 4 ohms for 72 Watts per channel via discrete, metal cased, TO-3 output transistors (2x 2SA744 & 2x 2SC1402). DC offset set to no greater than 10 mVDC (unloaded) either channels. AC Idle current at 300 mA. Floor noise >-60dBm. ____________________________ Great performing, Two-Tone, Silver & Bronze Face, Integrated Amplifier, the Kenwood KA-6004. Brushed aluminum milled face with all original matching brushed aluminum knobs. It's got its share of 'battle scars', most noticeably, dozens of small tics / pecks around the volume knob and a couple dozen around the left side (not sure what someone was doing to cause that), and a few other blems (see photos above). From some angles, the tics / pecks aren't too bothersome, from others, you'll see them. Original, 'Plastic' toggle bats replaced with 'Metal' handles. Great amp for about any 2-channel, audio system. LOT's of punch and headroom. VERY MUSICAL SOUNDING!!! Big Power with LOTS of INPUTS! Kenwood KA-6004 Features include: - Discrete Output Transistors - Large, power supply for plenty of headroom - Speaker selector for A or B, A+B or Off - Separate Bass and Treble controls, utilizing NOT pots, but a 2dB, 'Wafer Attenuator' and are TRUELY 'de-featable' for purest signal path when set to 'OFF' - Serviceable, 'Open' body switches for ease of future cleaning - Dual Tape Monitors with Bi-Directional dubbing (may also be used for Video / CD / DVD / LD / VCR / DAT / MP3 / iPod� / iPad� / iPhone� / iPod� / iTouch� / iGadget / eReader / MP3 / XM� / SIRIUS� etc. as well as for CDR) - Dual AUX Inputs (may also be used for Video / CD / DVD / LD / VCR / DAT / MP3 / iPod� / iPad� / iPhone� / iPod� / iTouch� / iGadget / eReader / MP3 / XM� / SIRIUS� etc.) - Tuner input (may also be used for Video / CD / DVD / LD / VCR / DAT / MP3 / iPod� / iPad� / iPhone� / iPod� / iTouch� / iGadget / eReader / MP3 / XM� / SIRIUS� etc.) - Both Tape I/O's feature DIN as well as standard RCA I/O's - Dual Phono / turntable inputs with built-in cartridge pre-amp - Stereo Mode switch for Stereo / Mono-Mix / Stereo-Reverse, L or R selector (very handy for trouble-shooting system and speakers - "Loudness" function to boost Bass and Treble in relationship to Mid frequencies at lower volume levels for a much fuller sound. - Dual, Built-in Low / Sub-Sonic filters for cutting turntable rumble / hum. 40Hz and 80Hz - Built-in High filter for @ 7 kHz. Great for reducing AM noise - Instant -20dB Audio-Muting / Volume attenuation - Front mounted 1/4" stereo headphone jack - Front mounted. L&R 1/4" 'Microphone' jacks (be careful running microphones into your 'home audio' speakers) - Rear located 'Mains' protection fuse - Pre-Amp out / Power-Amp In RCA loop with built-in Normal / Separate switch (no need for jumpers). - Quad convenience AC outlets; 3 Switched and 1 un-switched for a total capacity of 300 Watts - True "WORLD AC POWER"� allows unit to be operated on 50 or 60 Hz AC and will select voltages from 110v, 120v, 220v and 240 Volts AC input. Kenwood KA-6004 Original Specs: Design type: 2 Channels, AB operation Dynamic Power: 220 Watts / Channel @ 4 Ohms Rated RMS Output: 40 Watts per channel, min. RMS, at 8 Ohms, both channels driven, from 20Hz to 20kHz. Damping Factor DC-20,000 / 8Ω: 32 Power Bandwidth: 10Hz-40kHz THD; 0.5% at full rated power (40 W) into 8Ω w/ 20-20kHz. S/N on Phono MM w/ 2.5mV signal: 68dB S/N on Tuner / AUX / Tape w/ 110mV signal: 75dB Input Sensitivity Phono (MM): 2.5mV @ 50kΩ Input Sensitivity Microphone: 3mV @ 50kΩ Input Sensitivity Tuner / AUX / Tape: 200 mV @ 100kΩ Input Sensitivity Main Amp: 1V @ 50kΩ Tape Rec Level (Via RCA's): 200 mV Tape Rec Level (Via DIN): 40 mV Bass Control; �10dB @ 100Hz (2dB 'Step Switch Attenuator) Treble Control; �10dB @ 10kHz (2dB 'Step Switch Attenuator) Subsonic Filter: 40Hz, 12 dB/Oct Low Filter: 80Hz, 12 dB/Oct High Filter: 7kHz, 6 dB/Oct Loudness Control: +8dB @ 100Hz & +3dB & 10kHz (-30dB Vol Level) Great unit to provide the basis of a medium to medium large sized Hi-Fi system or 'project home studio'. Again, we have completely gone through it as stated above. Again, it's got a few 'battle scars', but that doesn't impede it's performance. Unit functions and sounds great! Measures 17.2" wide x 11.75" deep x 6.1" tall and weighs 26 lbs unpacked. Includes our 30 day limited warranty! Cond. 7.5 (due to tics / pecks / blems) KENWOOD KA-6004 SOLD 3/19/2024 SHIPPING TO JOSE IN CALIFORNIA (Above text, in it's entirety, property of www.oaktreevintage.com / Oak Tree Enterprises, LLC. See 'Copyright Information' page for details)



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*NEW LISTING 8/12/2022* (Click on above thumbnails to enlarge photos) warranty REFURBISHED / FULLY SERVICED / WARRANTED VINTAGE SANSUI STEREO INTEGRATED AMPLIFIER SANSUI AU-417 / AU417 CLASS A/B AMPLIFIER WITH DISCRETE OUTPUT TRANSISTORS! #...0001 MIJ "WORLD AC POWER" � Circa 1978-80 SOLD 2/13/2023 SHIPPED TO JERRY IN INDIANA � Our technician has completely gone through and 'Certified' this unit. � Everything was cleaned inside and out including all switches, controls and contacts. (Balance control still has a small amount of static when manipulated at extreme 'clockwise / right' position). � Internal fuses checked for correct value / function and replaced where necessary. � Solder joints reflowed on all possible high heat and stress points � Amplifier Bias set to proper 20mVDC at TP's � DC offset adjusted 0 (ZERO) mVDC L&R after 10 min warm-up. � All functions tested for perfect operation. � Following above procedures, unit was cosmetically detailed inside and out. � All inputs tested and both sides produce clean and even sine waves into static 8 & 4 ohm loads! No power supply hum of any kind. It's dead silent! � Following restoration procedures, the unit was run continuously at medium volume, as all our amplifier / receivers are, into a load with "Loudness" on and both Tone Controls at 10 for 48 hours. (Technicians note, "this is a very 'tech friendly & serviceable' amplifier design") On our test bench, each internal amplifier of this particular unit, #...0001, produced peak power of 27 Volts per channel at 8 Ohms for 91 Watts per channel and 23 Volts at 4 Ohms for 132 Watts per channel via discrete output transistors (2x 2SA1105 & 2x 2SC2580). AC current draw at Idle = 200mA. Bias set to correct 20.0mVDC. DC offset adjusted to a SUPER LOW 0 mVDC L&R. Floor noise > -74dBm. ____________________________ Very classy matte-black, Sansui AU-417 integrated amp. Huge, internal power supply and 'REAL' output transistors for lots of warmth and tone! Great, all-around amp for home or project recording studio. Sansui AU-417 Features include: - True Discrete Output, Class A/B amplifier - Speaker selector for A or B, A+B or Off - Super quality de-tented volume control - Separate Bass and Treble with high quality de-tented controls - "Tone By-pass" for the purest signal path - Loudness control. "Loudness" functions to boost Bass in relationship to Mid frequencies at lower volume levels for a much fuller sound - Dual tape deck monitors / I/O's. (Tape Monitors can be used with Tape decks such as Cassette Tape Recorders/ Players, Reel to Reel's, 8-Track Tape Cartridge Decks, Video / CD / DVD / VCR / DAT / MP3 / iPod� / iPad� / iPhone� / iTouch� / iGadget / MP3 / XM� / SIRIUS� CDR (CD recorders as well as for inserting signal processors, such as EQ's, Reverbs, Spatial Enhancers / Dynamic Processors, Noise Reduction units, Special Effects units, Time Delays, etc) - Bi-Directional Tape Dubbing / Copy function - Dual Phono inputs with built-in Phono Cartridge Pre-amp - Tuner input (can also be used for ( Video / CD / DVD / VCR / DAT / MP3 / iPod� / iPhone� / iTouch� / iGadget / MP3 / XM� / SIRIUS� etc. inputs) - AUX Input (may also be used for Video / CD / DVD / LD / VCR / DAT / MP3 / iPod� / iPad� / iPhone� / iPod� / iTouch� / iGadget / eReader / MP3 / XM� / SIRIUS� etc.) - Front mounted 1/4" stereo headphone jack - Back panel features full RCA patch bay for all inputs - Also features "spring-clip" speaker connectors for A&B - Triple AC convenience outlets with 2 Switched and 1 un-switched AC outlets for a maximum load of 350 watts of external gear. - True "WORLD AC POWER"� allows unit to be operated on 50 or 60 Hz AC and will select voltages from 110v, 120v, 220v and 240 Volts AC input. Sansui AU-417 Specifications: Output: Continuous 65 Watts per channel, min. RMS, @ 8 Ohms both channels driven, from 20Hz to 20kHz. *Design type:* 2 Channels, Integrated Pre / Class A/B operation Power Amplifier Damping Factor: >60@ 20-20kHz into 8Ω THD: 0.02% at full rated power into 8Ω w/ 20-20kHz Power Bandwidth: 20Hz-20kHz Frequency Response at 1 Watt: 5-100,000Hz S/N: 100dB for Tuner, Tape and AUX inputs Bass Control: �10dB @ 50Hz Treble Control: �10dB @ 15kHz Subsonic Filter: -3dB @ 16Hz & 6dB / Oct Loudness Control: +9dB @ 50Hz & +7dB @ 10kHz (-30dB Vol Level) Input Sensitivities: Non-Phono inputs = 150mV / 47kΩ Tape outputs: 150mV PHONO SECTION SPECS: Freq Response: 20Hz-20kHz w/ RIAA Equalization of �0.2dB S/N: >80dB Input Sensitivity: 2.5mV @ 47kΩ Phono Overload: 300mV but still maintaining 0.01% THD Again, as stated above, unit has been completely gone through and certified. All functions have been tested and pass with flying colors! Really no scratches, dings or dents to speak of. Just the most minor of tiny 'tics' to be found. Face and knobs are in beautiful condition. Unit looks fabulous and sounds great! Can include an 'e-copy' pdf download of the Sansui AU-417 owners / users / instruction manual and service manual if the purchaser desires. Measures 17" wide x 15.5" deep x 6.75" tall and weighs 27 lbs unpacked. Includes our standard 30 day limited warranty! SANSUI AU-417 Cond. 8.5+ SOLD 2/13/2023 SHIPPED TO JERRY IN INDIANA (Above text, in it's entirety, property of www.oaktreevintage.com / Oak Tree Enterprises, LLC. See 'Copyright Information' page for details)
*NEW LISTING* *7/15/2022* (Click on above thumbnails to enlarge photos) warranty RESTORED / REFURBISHED / FULLY SERVICED VINTAGE PIONEER STEREO INTEGRATED AMPLIFIER PIONEER SA-9500 STEREO INTEGRATED AMP #...913M Circa 1976-78 MIJ SOLD 10/21/2022 SHIPPED TO JOE IN TEXAS � Our technician has completely gone through and 'Certified' this unit. � Following both internal and external visual inspection, the entire unit was cleaned out including all contacts, switches and controls. Switches now clean sounding and performing solidly. Controls are smooth and silent. � Silicone heat sink compound inspected for �suppleness� � Output section bias adjusted to factory spec 20mVDC per service manual � Output DC offset adjusted to 0mVDC L & R at Test points � Solder joints reflowed where necessary on all possible high heat and stress points � Found output device temp sensors not mounted to heatsinks as they should have been. Technician mounted them with correct hardware. � All Controls / Switches cleaned and test for quietness (phono load adjustment pot sealed) � All functions tested for perfect operation. � All inputs and functions tested. � Both amplifier sides produce clean and even sine waves! No power supply hum of any kind. It's dead silent! � Following electronic refurbishing, the entire unit was cosmetically detailed. � Great looking unit. Owner had top sheet metal powder coated by a paint shop. Looks fabulous. � Following restoration procedures, the unit was ran continuously at medium volume, as all our amplifier / receivers are, into a load with "Loudness" on and both Tone Controls at 10 for 48 hours. On our test bench, each internal amplifier of this particular unit, #...913M, produced peak power of 28 Volts @ 8Ω per channel for 98 Watts / channel and 24 Volts @ 4Ω per channel 144 Watts / channel via 8 discrete output devices at 1kHz. (NEC 2SB541 & 2SD388). DC offset adjusted to <30mVDC L&R at speaker outputs, but ZERO mVDC at factory test points. Bias correctly set to 20mV per service manual. AC Mains Idle current draw .5A. Very quiet with Floor noise measured at -70dB ____________________________ Great performing and 'classic' looking Pioneer SA-9500-II Integrated Amplifier. This amp is designed and built around a more than ample power supply with huge, 18,000 uF filter capacitors. Loaded with 'usable' features. Great unit to provide the heart of a medium to mid-large sized Hi-Fi system. Unit looks, works and sounds great! Pioneer SA-9500 Features include: - Discrete Output, Class A-B Amplifier design - Speaker A, B, A+B, Off selector - Separate Bass and Treble controls featuring high-quality, de-tented controls with selectable 'Turn-over' frequencies (see specs below for details) - "Tone Defeat" allows Tone control circuitry to be bypassed for purest signal path - Pre-Amp out / Power-Amp In RCA loop with built-in Connect / Separation switch. - Dual tape deck monitors (Tape Monitors can be used with Video / CD / DVD / VCR / DAT / MP3 / iPod� / iPad� / iPhone� / iTouch� / iGadget / MP3 / XM� / SIRUS� CDR (CD recorders as well as for inserting signal processors, such as EQ's, Reverbs, Spatial Enhancers / Dynamic Processors, Noise Reduction units, Special Effects units, Time Delays, etc) - 'Tape Dubbing Capability - DUAL AUX inputs (may also be used for Video / CD / DVD / LD / VCR / DAT / MP3 / iPod� / iPhone� / iPod� / iTouch� / iGadget / eReader / MP3 / XM� / SIRUS�, audio mixers, computer sound-cards etc.) - Dual Phono / Turntable inputs with 4-position Cartridge 'Capacitance' and 'Variable Resistance to -12dB' loading / selection on side panel (near patch bay) - 1/4" Microphone input - Tuner input (may also be used for Video / CD / DVD / LD / VCR / DAT / MP3 / iPod� / iPhone� / iPod� / iTouch� / iGadget / eReader / MP3 / XM� / SIRUS�, audio mixers, computer sound-cards etc.) - Oversize volume control pot, de-tented in 3dB steps - Subsonic filter with two selectable frequencies (see specs for details) for reducing turntable rumble - Hi filter with two selectable frequencies (see specs for details) to reduce tape & electronic hiss, noise and record static - Stereo Mode selector for Normal, Reverse & Mono L+R, L or R - 3-Position Attenuator / Muting selector for instant 'audio muting' of volume - 1/4" stereo headphone jack - Triple AC Convenience outlets (2 switched and 1 un-switched) with a total capacity of 200 Watts Original Pioneer SA-9500 Specifications: Design type: 2 Channel, Dual-Power supply, discrete output, Class A-B Max Power Consumption; 370 Watts POWER AMP SPECIFICATIONS: Power output: 80WPC min RMS @ 8 Ohms or 100WPC min RMS @ 4 Ohms & no more than 0.1% THD @ 20-20kHz THD; <0.1% @ full rated power or 0.05% at 50% power output IHF IMD; Same as above Freq Response: 10Hz to 80kHz w/ deviation of �0.1dB Damping factor; >30 @ 8Ω / 20-20kHz Signal to noise ratio: 100dB (line) Input sensitivity @ Power Amp IN: 1V @ 50kΩ PRE-AMP SPECIFICATIONS: EQ / Tone Control section characteristics: 3-Stage, DC, Class-A THD; <0.05% @ 20-20kHz Input sensitivity on Tape and / or AUX / TUNER / CD: 150mV & 50kΩ Mic Input: 6mV to 24mV / 85kΩ All 'TAPE' Outputs: 150mV / 50kΩ Pre-Amp Output: 2V / 1kΩ Signal to noise ratio for all 'Line' inputs: >90dB Signal to noise ratio for Mic input: >65dB Tone Controls @ 2dB steps. Bass: �10dB @ 25Hz/50Hz/100Hz Selectable Bass Turn-Over Freq: @ 100Hz/200Hz/400Hz Treble: �10dB @ 8kHz/16kHz/32kHz Selectable Treble Turn-Over Freq: @ 2kHz/4kHz/8kHz Low Filter: 12dB/OCT @ 15Hz or 30Hz High Filter: 12dB/OCT @ 8kHz or 12kHz Freq Response of 'Line' inputs: 7Hz to 40kHz w/ deviation of +0dB / -1dB Instant Volume Attenuator; 0dB, -15dB or -30dB PHONO SECTION SPECS; Freq Response; 30Hz-15kHz RIAA deviation of �0.2dB Signal to noise ratio for Phono 1 & 2 inputs: >70dB Input Sensitivity Phono 1; 2.5mV @ 50kΩ Input Sensitivity Phono 2; 2.5mV-10mV @ Selectable 35kΩ, 50kΩ, 70kΩ, or 100kΩ. Phono 1 Overload; 250mV @ 1kHz Phono 2 Overload; 250mV-500mV @ 1kHz Again, as stated before, our technician has completely refurb'd this Pioneer SA-9500 Stereo Integrated amplifier, cleaning and testing all and it gets our full 'Certification'. Great integrated amplifier for just about any stereo system. This is a fabulous amp. Was pretty good before, and now Sonically Supurb following our techs work. Very musical. Lots of solid power / punch. Unit looks near new, with only a scratch on the volume knob and sounds great! Can include a pdf 'e' copy of the Pioneer SA-9500 Owners / Users Manual. Measures 16.5" wide x 15.85" deep x 6.5" tall and weighs a HEAVY 38 lbs unpacked. Includes our 30 day limited warranty. Pioneer SA-9500 Stereo Integrated amplifier Condition 8.5+++ (C) D.B. SOLD 10/21/2022 SHIPPED TO JOE IN TEXAS (Above text, in it's entirety, property of www.oaktreevintage.com / Oak Tree Enterprises, LLC. See 'Copyright Information' page for details)	*NEW LISTING* *7/19/2022* (Click on above thumbnails to enlarge photos) warranty RESTORED / REFURBISHED / FULLY SERVICED VINTAGE HARMAN/KARDON STEREO / A/V INTEGRATED AMPLIFIER HK PM645 VXI STEREO INTEGRATED AMP #...2221 Circa 1985-87 MIJ SOLD 1/5/2023 SHIPPED TO SPRINGER IN CALIFORNIA � Our technician has completely gone through and 'Certified' this unit.* � Following both internal and external visual inspection, the entire unit was cleaned out including all contacts, switches and controls. Switches now clean sounding and performing solidly. Controls are smooth and silent. � Silicone heat sink compound inspected for �suppleness� � Output section bias adjusted � Output DC offset adjusted to <16mVDC L & R � Solder joints reflowed where necessary on all possible high heat and stress points � All Controls / Switches cleaned and test for quietness (phono load adjustment pot sealed) � All functions tested for perfect operation. � All inputs and functions tested. � Both amplifier sides produce clean and even sine waves! No power supply hum of any kind. It's dead silent! � Following electronic refurbishing, the entire unit was cosmetically detailed. Does have some minor clear coat flaking on some of the knobs (see photos above). � Following restoration procedures, the unit was ran continuously at medium volume, as all our amplifier / receivers are, into a load with "Loudness" on and both Tone Controls at 10 for 48 hours. On our test bench, each internal amplifier of this particular unit, #...2221, produced peak power of 28 Volts @ 8Ω per channel for 98 Watts / channel via discrete output devices at 1kHz. (2x 2SA1265 & 2x2SC3183). DC offset adjusted to <16mVDC L&R. Bias adjusted. AC Mains Idle current draw .6A. Very quiet with Floor noise measured at -60dB ____________________________ Great performing and 'classic' looking Harman / Kardon / hk PM645 VXi-II Integrated Amplifier. Loaded with 'usable' features. Great unit to provide the heart of a medium to mid-large sized Hi-Fi system. Unit looks decent, works and sounds great! Designed around 'HCC' (High-instantaneous Current Capability) architecture. From the owners manual; "Studies have shown that while reproducing dynamic music signals the instantaneous impedances of nearly all loudspeakers drop to less than one third of the nominal ratings. These low, instantaneous mipedances typically require 3 to 6 times more current than an 8 Ohm, 'resistive' load. Reduced dynamic range and increased distortion will result if the amplifier cannot provide these higher currents. For this reason, the PM645 was designed to provide 30 Amperes of instantaneous current." Harman / Kardon PM645 VXi Features include: - Discrete Output, Class A-B Amplifier design - * A/V for 'switching purposes' ONLY! No 'A/V' processing inside...thankfully! All Analog / 2-Channel. Switches Video signals as well as the 'Audio' signals when using the 'Input' or 'Tape Monitor' selector. - Speaker A, B, A+B, Off selector - Separate Bass and Treble controls - Dual tape deck monitors (Tape Monitors can be used with Video / CD / DVD / VCR / DAT / MP3 / iPod� / iPad� / iPhone� / iTouch� / iGadget / MP3 / XM� / SIRUS� CDR (CD recorders as well as for inserting signal processors, such as EQ's, Reverbs, Spatial Enhancers / Dynamic Processors, Noise Reduction units, Special Effects units, Time Delays, etc) - Tape Dubbing Capability 1 > 2 - CD input (may also be used for Video / CD / DVD / LD / VCR / DAT / MP3 / iPod� / iPhone� / iPod� / iTouch� / iGadget / eReader / MP3 / XM� / SIRUS�, audio mixers, computer sound-cards etc.) - Phono / Turntable input with selector for MM (Moving Magnet cartridge) or MC (Moving Coil Cartridge) (Built-In MC "head amp". this feature alone could be worth hundreds of $$ if you are going to utilize a Moving Coil cart). - "External Processor" is another 'loop' downstream from the 'Tape Monitor', but ahead of the Volume control used for inserting signal processors, such as EQ's, Reverbs, Spatial Enhancers / Dynamic Processors, Noise Reduction units, Special Effects units, Time Delays, etc) - Tuner input (may also be used for Video / CD / DVD / LD / VCR / DAT / MP3 / iPod� / iPhone� / iPod� / iTouch� / iGadget / eReader / MP3 / XM� / SIRUS�, audio mixers, computer sound-cards etc.) - Video input (may also be used for Video / CD / DVD / LD / VCR / DAT / MP3 / iPod� / iPhone� / iPod� / iTouch� / iGadget / eReader / MP3 / XM� / SIRUS�, audio mixers, computer sound-cards etc.) - "Loudness" function to boost Bass and Treble in relationship to Mid frequencies at lower volume levels for a much fuller sound. - Subsonic filter with two selectable frequencies (see specs for details) for reducing turntable rumble - Stereo Mode selector for Normal 'Stereo' or Mono L+R - Switch on rear to select speaker load impedance (4 or 8 Ohms) - 1/4" stereo headphone jack - Dual AC Convenience outlets (1 switched and 1 un-switched) with a total capacity of 360 Watts Original Harman / Kardon PM645 VXi Specifications: Design type: 2 Channel, Dual-Power supply, discrete output, Class A-B Max Power Consumption; 248 Watts (not including 'convenience outlets) POWER AMP SPECIFICATIONS: Power output: 70WPC min RMS @ 4 or 8 Ohms & no more than 0.1% THD @ 8 Ohms and 0.3% THD @ 4 Ohms and from 20-20kHz THD; <0.1% @ full rated power Freq Response @ 1/2 rated output: 10Hz to 100kHz Damping factor; >60 @ 8Ω / 1kHz PRE-AMP SPECIFICATIONS: THD; 0.1% @ 1kHz Input sensitivity on Tape and / or AUX / TUNER / CD / A/V: 135mV All 'TAPE' Outputs: 150mV Signal to noise ratio for all 'Line' inputs: 80+dB Channel Separation for all 'Line' inputs: >66dB @ 10kHz Bass: �10dB @ 50Hz Treble: �10dB @ 10kHz Low Filter: -3dB @ 15Hz & 6dB / Oct PHONO SECTION SPECS; Freq Response; 20Hz-20kHz with RIAA deviation of �0.2dB Signal to noise ratio for Phono MM: >79.5dB Signal to noise ratio for Phono MC: >76.5dB Channel Separation for Phono MM inputs: 58dB @ 10kHz Channel Separation for Phono MC inputs: 50dB @ 10kHz Input Sensitivity Phono MM; 2.2mV Input Sensitivity Phono MC; 120uV Phono 1 Overload; 108mV Phono 2 Overload; 5.6mV Again, as stated before, our technician has completely refurb'd this Harman / Kardon / hk PM645 VXi Stereo Integrated amplifier, cleaning and testing all and it gets our full 'Certification'. Great integrated amplifier for just about any mid-medium/large stereo system. Handsome, 'Champaign' finish. Again, does have some discoloration on some of the knobs, and a few hairline striations, but nothing too distracting. Lots of solid power / punch. Unit looks good and sounds great! Can include a pdf 'e' copy of the Harman / Kardon / hk PM645 Owners / Users Manual (same thing, just the "VXi" has the 'video switching'). Measures 17.5" wide x 13.85" deep x 4.2" tall and weighs 15 lbs unpacked. Includes our 30 day limited warranty. Harman / Kardon / hk PM645 VXi Stereo Integrated amplifier Condition 8.5 SOLD 1/5/2023 SHIPPED TO SPRINGER IN CALIFORNIA (Above text, in it's entirety, property of www.oaktreevintage.com / Oak Tree Enterprises, LLC. See 'Copyright Information' page for details)				*NEW LISTING* *7/13/2022* (Click on above thumbnails to enlarge photos) warranty PRE-OWNED FISHER INTEGRATED POWER AMPLIFIER FISHER CA-283 STEREO INTEGRATED AMPLIFIER "196 WPC MONSTER" #...8451 Circa late 1980's MIJ SOLD 10/20/2022 SHIPPED TO TIM IN INDIANA � Our technician has completely gone through and 'Certified' this unit. � Following both internal and external visual inspection, the entire unit was cleaned out including all contacts, switches and controls. Switches now clean sounding and performing solidly. Controls are smooth and silent. � Silicone heat sink compound inspected for �suppleness� � Output section bias adjusted to factory spec 7mVDC per service manual � Output DC offset adjusted to 0mVDC! L & R � Solder joints reflowed where necessary on all possible high heat and stress points � All Controls / Switches cleaned where necessary and test for quietness ('Balance' control has remaining issues near it's extreme right and left, but works as intended throughout the majority of it's range.) � All functions tested for perfect operation. � All inputs and functions tested. � Both amplifier sides produce clean and even sine waves! No power supply hum of any kind. It's dead silent! � Both meter lamps replaced #25-500. � Following electronic refurbishing, the entire unit was cosmetically detailed. � Great looking with a few minor 'battle scars', but other than some striations on the top sheet metal, nothing too distracting. � Following restoration procedures, the unit was ran continuously at medium volume, as all our amplifier / receivers are, into a load with "Loudness" on and both Tone Controls at 10 for 48 hours. On our test bench, each internal amplifier of this particular unit, #...8515, produced peak power of 33 Volts @ 8Ω per channel for 136 Watts / channel and 28+ Volts @ 4Ω per channel 196 Watts / channel via 8 discrete output devices at 1kHz. (Toshiba 2X 2SA1301 & 2X 2SC3280). Bias set to 7mVDC .DC offset adjusted to ZERO mVDC L&R! ____________________________ This Fisher CA-283, Integrated Amplifier, like all of it's siblings we've done, seemed like a 'sleeper' when we originally acquired it. Then we did our preliminary tests and quickly changed our opinion. Once our tech got finished with it, we were thoroughly surprised and impressed. It has a lot of punch and headroom (check our bench test results above against it's original specs) and is VERY MUSICAL sounding. While it's got a few 'battle scars' (see photos above), they of course don't affect it's spectacular performance. ____________________________ Fisher CA-283 Features include: - 4-Way Built-in Protection - Externally located, vertically oriented, oversized, aluminum heatsinks (all amps should be designed this way) - 5-Band, Graphic EQ for more accurate tone control than simply a Bass and Treble control - Independent speaker selector switches for A, B, A+B, Off - 'Electronic / Push-Bar' volume control with corresponding LED progress indicator - Phono / Turntable input with Built-In Phono Pre-Amp - �Tape� is a 'TRUE' tape monitor (Tape Monitors can be used with Tape decks such as Cassette Tape Recorders/ Players, Reel to Reel's, 8-Track Tape Cartridge Decks, Video / CD / DVD / VCR / DAT / MP3 / iPod� / iPad� / iPhone� / iTouch� / iGadget / MP3 / XM� / SIRUS� CDR (CD recorders as well as for inserting signal processors, such as EQ's, Reverbs, Spatial Enhancers / Dynamic Processors, Noise Reduction units, Special Effects units, Time Delays, etc) - Aux / �Video Sound� input (can be used with Tape decks such as Cassette Tape Recorders/ Players, Reel to Reel's, 8-Track Tape Cartridge Decks, Video / CD / DVD / VCR / DAT / MP3 / iPod� / iPad� / iPhone� / iTouch� / iGadget / MP3 / XM� / SIRUS�) - Tuner input (can be used with Tape decks such as Cassette Tape Recorders/ Players, Reel to Reel's, 8-Track Tape Cartridge Decks, Video / CD / DVD / VCR / DAT / MP3 / iPod� / iPad� / iPhone� / iTouch� / iGadget / MP3 / XM� / SIRUS�) - CD input (can be used with Tape decks such as Cassette Tape Recorders/ Players, Reel to Reel's, 8-Track Tape Cartridge Decks, Video / CD / DVD / VCR / DAT / MP3 / iPod� / iPad� / iPhone� / iTouch� / iGadget / MP3 / XM� / SIRUS�) - Loudness for enhancing Bass and Treble response at lower volume levels - Dual 7-Segment, LED Power Level Meters - "Remote Control" jack for compatible Fisher components if you have them - Wireless remote capable, but remote control not included, nor available from us - 2-Pin power supply output for compatible Fisher FM-270A or FM-271A tuner and CR-W74H or CR-W75H cassette deck - Front mounted, ��, Stereo headphone jack Original FISHER CA-283 Specifications: AMP SPECIFICATIONS: Power output: 100WPC min RMS @ 8 Ohms & no more than 0.05% THD @ 20-20kHz THD; <0.05% @ full rated power IHF IMD; 0.05% @ full rated power & 8 Ohms Freq Response of Pre-amp section: 20Hz to 20kHz w/ deviation of �0.1dB Damping factor; >20 @ 8Ω / 1kHz Signal to noise ratio: 90dB (line) Input sensitivity on Tape and / or AUX / TUNER / CD: 150mV (all at 50kΩ) EQ / Tone Control section characteristics: Bass 63Hz w/ �10dB Mid-Bass 250Hz w/ �10dB Midrange 1kHz w/ �10dB Mid-Treble 4kHz w/ �10dB Treble 16kHz w/ �10dB Loudness Control; +8dB @ 100Hz and +4dB @10kHz Max Power Consumption; 470 Watts PHONO SECTION SPECS; Freq Response; RIAA deviation of �0.1dB Input Sensitivity; 2.5mV @ 50kΩ Phono Overload; 125mV Again, we have done the previously stated refurbishment / restoration work on this unit to insure it's performance, and it gets our full 'Certification'. All functions tested for perfect operation. As we stated earlier, it's got a few 'battle scars' (mostly not visible from the front), but nothing too distracting. Unit Performs and sounds great! Includes an 'e' copy, PDF of the Fisher CA-283 owners / user manual. We can also include an 'e' copy, PDF of the Fisher CA-283 Service manual if the purchaser wishes. Measures 17.33" wide x 4.2" tall x 12.25" deep and weighs 18 lbs unpacked. Includes our standard 30 day limited warranty. Cond. 8+ FISHER CA-283 INTEGRATED AMPLIFIER SOLD 10/20/2022 SHIPPED TO TIM IN INDIANA (Above text, in it's entirety, property of www.oaktreevintage.com / Oak Tree Enterprises, LLC. See 'Copyright Information' page for details)
*NEW LISTING 8/29/2022* (Click on above thumbnails to enlarge photos) warranty REFURBISHED / FULLY SERVICED & WARRANTED YAMAHA C-50 / C50 STEREO PRE- AMPLIFIER #...3052 ANALOG PREAMP / CONTROL AMP with QUASI-PARAMETRIC EQUALIZER! Circa 1982-84 MIJ SOLD 9/15/2022 SHIPPED TO MARK IN CALIFORNIA Our technician has completely gone through and 'Certified' this unit. Everything was cleaned inside and out including cleaning and re-flowing solder joints as necessary including ALL RCA I/O jacks. Power switch lamp / bulb working. All functions tested for perfect operation. All inputs tested and both side produces clean and even sine waves! Checked with O-Scope. No power supply hum of any kind. It's dead silent! Yamaha C-50 Analog, Stereo Pre-amp / control center. This is 'one quiet' pre-amp. 'Cross pollination' from one input to another is also incredibly low. We were astounded by it's performance in that respect. Features include: - 2-Band Quasi-Parametric (meaning sweepable frequency centers) EQ / Tone Controls. - Tone Defeat selector for purest signal path - Subsonic filter at 15Hz for reducing turntable rumble / feedback - Dual tape monitors (Tape Monitors can also be used for Tape / Video / CD / DVD / VCR / DAT / MP3 / iPod� / iPhone� / iTouch� / iGadget / MP3 / XM� / SIRUS� etc. etc. as well as for CDR) (note; tape monitors on most Yamaha units, including their pre-amps are combined with source selection, thus any external signal processors are relegated to the Pre's "Output" to Power Amp "Input" signal chain) - Dual AUX Inputs (can be used for CD / DVD (used for 'Audio Only' as an input to the pre-amp) / DAT / MP3 / iPod� / iPhone� / iTouch� / iGadget / MP3 / XM� / SIRUS� etc. etc.) - Tuner input (can be used for Video / CD / DVD / VCR / DAT / MP3 / Video / iPod� / iPhone� / iTouch� / iGadget / MP3 / XM� / SIRUS� etc. etc.) - Dual Phono / Turntable inputs with selector for either MM (Moving Magnet cartridge) or MC (Moving Coil Cartridge) (this feature alone could be worth hundreds of $$ if you are going to utilize a Moving Coil turntable cartridge) - MC Phono Direct (bypasses 'phono selector' switches thus allowing MC signal to go thru the least amount of switch contacts) - Record Out selector with bi-directional tape dubbing controls. (Separate "Record Out" allows recording from one source while you listen to another) - Global Stereo / Mono selector - 24 Karat Gold plated I/O jacks on Phono Inputs. - Instant -20 dB Audio Level Muting - Triple AC outlets ( 2 switched, 1 un-switched) for a total capacity of 500 watts Yamaha C-50 Preamp Original Specs: *Design type:* 2-Channels, Analog operation Frequency Response: DC-100kHz +0 / -0.5dB on all 'Non-Phono' inputs Maximum Output Level @ 'Pre': 10V @ 0.1%THD THD on all inputs except 'Phono': 0.001% at 5V IHF IM DISTORTION; 0.002% S/N @ all 'non-phono' inputs: 96dB Channel Separation: 70dB @ 1kHz Residual Noise: 2.5μV Input Sensitivity AUX / Tape; 50-150mV @ 47kΩ Maximum Output Level 'Rec Out': 150mV @ 470 Ohms Bass Control; �10dB Selectable Center from 100Hz to 500Hz Treble Control; �10dB Selectable Center from 1KHz to 5kHz Low Filter; 15Hz @ -12dB / Oct Audio Muting; -20dB Headphone Maximum Output Level: 0.45V @ 8 Ohms Phono Section: Frequency Response: 20-20kHz +0 / -0.2dB on Phono MM and / or MC Selectable Phono MM Sensitivity (for full pre-amp output) / impedance / capacitance: 2.5mV @ 100Ω 2.5mV @ 47kΩ / 100pF 2.5mV @ 47kΩ / 220pF 2.5mV @ 47kΩ / 330pF Phono MC Sensitivity: 100μV @ 100Ω Phono MC minimum Sensitivity: 33uV Phono MM minimum Sensitivity: 0.83mV Phono MM Maximum Input Level: 220mV @ <0.1% THD Phono MC Maximum Input Level: 8.5mV @ <0.1% THD THD on 'MM'; 0.001% @ 3V output THD on 'MC'; 0.002% @ 3V output S/N on Phono MM w/ 5mv signal: 93dB S/N on Phono MC w/ 5mv signal: 90dB Channel Separation MM: 80dB @ 1kHz Phono Capacitance: Selectable (see above) Again, as stated before, our technician has completely refurb'd this Yamaha C-50 , stereo Pre-Amp, cleaning and testing all and it gets our full 'Certification'. This Yamaha C-50 is a very high quality control / pre-amplifier for most any system especially those requiring EQ / Tone Control section. Yamaha has always been known for building pre-amps that can hold their own with units 3-5 times the cost. Will work with most any power amplifier, tube or solid state. Cosmetically the top bonnet / sheet metal has numerous scratches from someone stacking a unit with no feet installed. Not seen when unit is in a rack, but they're there. Also, there's a few minor tics on the upper, right edge of the face plate (see photos above). After bench work the unit performs and sounds great! Comes with a pdf / 'e' copy of the Yamaha C-50 owners / users manual and a copy of the service manual if the purchaser desires. Unit measures 17.25" wide x 3.75" tall x 14.5" deep and weighs 15 lbs unpacked. Includes our standard 30 day limited warranty. YAMAHA C-50 PRE-AMPLIFIER Condition 8 (only due to scratches on top case) (C) M.S. SOLD 9/15/2022 SHIPPED TO MARK IN CALIFORNIA (Above text, in it's entirety, property of www.oaktreevintage.com / Oak Tree Enterprises, LLC. See 'Copyright Information' page for details)	*NEW LISTING 8/12/2022* (Click on above thumbnails to enlarge photos) warranty REFURBISHED / FULLY SERVICED & WARRANTED PRE-APPRECIATED KENWOOD PRE-AMP / CONTROL AMPLIFIER KENWOOD BASIC C-1 #...0575 Circa 1983-84 Made in Japan SOLD 1/6/2023 SHIPPED TO JAMES IN MINNESOTA � Our technician has completely gone through this unit. � We have completely gone through this unit, cleaning inside and out including all contacts, switches and controls. � Unit All RCA I/O jack terminal solder joints re-flowed internally � Found intermittent contacts on relay located on 'Line Out' PCB. Burnished internal contacts and cleaned. Now has solid output! � Unit cosmetically detailed. Has a few minor, light scratches on the metal case / cover � All functions tested for perfect operation. � All inputs tested fine following I/O re-flow operation � Both sides produce clean and even sine waves! � No power supply hum of any kind. It's dead silent! ____________________________ Great 'utilitarian' pre-amp (in fact, while waiting 4 years for two missing knobs for a previous C-1 to show up, we had been using one here on a number of systems so I'm VERY familiar with it). GREAT sounding as well. Check out the 108dB S/N!!! Kenwood C-1 Pre-amp / control center. Kenwood C-1 Features include: - Separate Bass and Treble Controls - Variable Loudness (Not just a push switch for On / Off) - Dual tape monitors with A>B dubbing (may also be used for Video / CD / DVD / LD / VCR / DAT / MP3 / iPod� / iPad� / iPhone� / iPod� / iTouch� / iGadget / eReader / MP3 / XM� / SIRIUS� etc.) - AUX / CD (may also be used for Video / CD / DVD / LD / VCR / DAT / MP3 / iPod� / iPad� / iPhone� / iPod� / iTouch� / iGadget / eReader / MP3 / XM� / SIRIUS� etc.) - Tuner input (may also be used for Video / CD / DVD / LD / VCR / DAT / MP3 / iPod� / iPad� / iPhone� / iPod� / iTouch� / iGadget / eReader / MP3 / XM� / SIRIUS� etc.) - Phono input - Selector for MM or MC cartridges as it has a built-in Moving Coil Head Amp (that's worth the 'price of admission' if you need it) - Subsonic filter for reducing turntable rumble / feedback - Loudness - Indicator LED's for input selector - 3 AC outlets ( 2 switched 1 un-switched) for a total capacity of 300 watts Kenwood C1 Original Specs: Design type: 2 Channels, Analog operation Frequency Response (non-phono input): 1-250kHz +0 / -3dB Maximum Output Level: 5V THD Tuner, AUX and Tape, 20-20,000Hz: 0.004% @ 1V output Signal / Noise Ratio: 108dB!!! @ Tuner, Aux, Tape A/B inputs Input Sensitivity AUX / Tape @ RCA's: 150mV @ 47k Ω @ 1kHz for rated output *Output AUX / Tape @ RCA's:* 150mV @ 47k Ω Subsonic Filter: >-3dB @ 30Hz, 6 dB/Oct Loudness Control: 0-+9dB continuously variable (-30dB Vol Level) PHONO SECTION SPECS: Freq Response: RIAA Standard curve 30Hz-20kHz w/ RIAA deviation of �0.3dB S/N: >87dB MM, >70dB MC THD Phono MM or MC, 20-20,000Hz: 0.005% @ 1V output Input Sensitivity (nominal) MM: 2.5mV @ 47kΩ Input Sensitivity (nominal) MC: .25mV @ 100Ω Phono Overload for MM: 200mV yields THD 0.005% @ 1kHz Phono Overload for MC: 15mV yields THD 0.005% @ 1kHz This is a great control pre-amplifier for if you just need a good 'utilitarian' pre-amp (but with a built-in MC Head Amp). Perfect for basic control of system. Can include an 'e-copy' pdf download of the Kenwood Basic C-1 owners / users / instruction manual and the brochure and service manual if the purchaser desires. Unit looks and sounds great! Unit measures 17.25" wide x 3" tall x 13" deep and weighs 10 lbs unpacked. Includes our standard 30 day limited warranty. KENWOOD BASIC C-1 Cond. 8.5+ SOLD 1/6/2023 SHIPPED TO JAMES IN MINNESOTA (Above text, in it's entirety, property of www.oaktreevintage.com / Oak Tree Enterprises, LLC. See 'Copyright Information' page for details)				*NEW LISTING 8/12/2022* (Click on above thumbnails to enlarge photos) warranty REFURBISHED / FULLY SERVICED & WARRANTED PRE-APPRECIATED KENWOOD POWER AMPLIFIER KENWOOD BASIC M2 POWER AMP WITH "SIGMA DRIVE"* 960+ WATT MONSTER!!! #...0112 Circa 1982-84 MIJ SOLD 1/6/2023 SHIPPED TO JAMES IN MINNESOTA � Our technician has completely gone through and 'Certified' this unit. � Unit bench checked / tested. � Amp has been cleaned inside and out. � Face removed, meter illumination lens removed, cleaned and reattached. � All new panel illumination lamps replaced with new. � Bias adjusted to proper 13mVDC per SM. � DC Offset able to be adjusted all the way down to 0 (ZERO) VDC!** � All functions have been tested and pass with flying colors! Amp designed using Huge Power Supply Transformers and oversized, vertical finned heat sink for very efficient and quiet, fan induction cooling of output devices. All inputs tested and both side produces clean and even sine waves! No power supply hum of any kind. It's dead silent! Following restoration procedures, we burned it in, in the shop at continuous volume for 48 hours straight and it functioned flawlessly. While this amp is originally rated at 200 WPC, 20-20kHz with both channels driven, on our test bench, this particular unit's (#...0112) amplifiers individually, @ 1kHz produced 45 Volts at 8 Ohms per channel for 253 Watts / channel and 40 Volts at 4 Ohms per channel for 400 Watts / channel via output devices (2x Sanken DAT1018P & 2x DAT1521P). (Idle AC current draw @ .75A. Floor noise measured at L= 00.0mVAC and R=00.0mVAC / -60dBm) Great, later model, and BIG WATTAGE power amp by Kenwood. Model 'Basic M2'. HUGE power output! Excellent for 2-channel (stereo) audio listening in a medium-large to larger stereo system, or for use in an A/V system. Lots of punch and headroom. Kenwood BASIC M2 Features: - True DUAL power supplies (yes, TWO HUGE, copper shielded transformers inside) and Elna brand capacitors - SIGMA DRIVE amplifier. (Hey, it's complicated but is what accounts for the specs listed below. Here's a link to a very 'readie and technical' pdf you can digest at your leisure:* http://www.cieri.net/Documenti/Kenwood/Documenti%20tecnici/Kenwood%20-%20Sigma-Drive%20Technical%20Guide.pdf - Old Skoool Class A/B amplifier design (NO Digital here!) - 2- Channel stereo operation - Off or A or B or A+B speaker selector via high current relay - Dual, Vertical, 7-Segment LED Power Output Meters with Dual Position Level Selector and Peak Hold with selectable "Hold Time" - Built-in, INDEPENDANT Protection circuit relays for each, separate channel - Large current resistors in the power amp section - LED Status indicators - Front-mounted 1/4" stereo headphone jack - RCA input jacks - Fan / Induction cooling (quiet though) - Dual, vertical finned internal heat sink - 3 Rear-mounted AC convenience outlets (2 switched and 1 un-switched for a total capacity of 500 Watts) (not included in the total power consumption spec) Kenwood BASIC M2 Original Specs: "200 Watts per channel minimum RMS, both channels driven @ 8ohms, 20-20k, with no more than 0.004% THD" Design type: 2 Channels, AB operation Slew Rate: 100 Volts / μsec (that's pretty darn fast) Rise Time: 100 Volts / μsec (and that's pretty darn quick) Damping Factor: >1000 @ 50Hz / 8 ohms (I've never heard of a "damping factor" that high, but I double checked the specs listed in both the OM and SM. A damping factor that high and it's VERY high 'Slew Rate', and fast "Rise Time" makes for some seriously 'tight' bass!!!...still not quite believing it. I sold pro audio amps for years, and I don't remember any of them coming close to that) Signal / Noise: 120dB A weighted (about as good as it can get!) Rated RMS Output: 200 Watts per channel, min. RMS, @ 8Ω, both channels driven, from 20Hz to 20kHz. Music Power 250 Watts + 250 Watts Output at initial clip: 242 Watts per channel @ 8Ω or 324 Watts per channel @ 4Ω, both channels driven, from 20Hz to 20kHz. Dynamic (Music) Power; 325 Watts + 325 Watts @ 8Ω 484 Watts + 484 Watts @ 4Ω THD:* 0.004% at 'Full Rated Output' / 8Ω w/ 20-20kHz 0.004% @ half rated power / 8Ω w/ 20-20kHz 0.001% @ half rated power / 8Ω w/ 1kHz IMD: 0.004% @ rated power / 8Ω Potential Frequency Response: 1Hz (essentially "DC")-200kHz +0dB / -3dB Input Sensitivity: 1V / 47KOhms Potential Power Consumption: 1350 Watts (that's more than your blow dryer or your bathroom heater!!!) Again, as stated before, our technician has completely refurb'd this Kenwood Basic M2, stereo Power-Amp, cleaning and testing all and it gets our full 'Certification'. Cosmetically there's just a few minor scuffs / tics on the front panel, and a narrow scuff on the meter window (see photos above). Great 'all around' power amp for about any audio system. We have sold MANY of this series of Kenwood power amps over the past 2+ decades, with never a complaint. If you're looking for about as much REAL power in a home audio amp that you can get, this is one of the top candidates. Includes an 'e-copy' pdf download of the Kenwood Basic M2 owners / users / instruction manual. Unit looks, works and sounds great! Unit measures 17.25" wide x 14.75" deep x 7.25" high and weighs a heavy 34+ lbs unpacked. Includes our standard 30 day limited warranty. KENWOOD BASIC M2 Cond. 8.5++ (C) R.R. SOLD 1/6/2023 SHIPPED TO JAMES IN MINNESOTA (Above text, in it's entirety, property of www.oaktreevintage.com / Oak Tree Enterprises, LLC. See 'Copyright Information' page for details)
*NEW LISTING 9/1/2021* (click on above thumbnails to enlarge photos) warranty REFURBISHED / FULLY SERVICED & WARRANTED VINTAGE PIONEER STEREO PRE-AMPLIFIER THE VERY SOUGHT AFTER PIONEER SPEC-1 (aka C-77) RACK MOUNTABLE W/ ORIGINAL BOX & PACKING #...3348M Circa ~1978-'82 "WORLD AC POWER" � MIJ SOLD 4/5/2022 SHIPPED TO LEWIS IN GEORGIA � Our technician has completely gone through and 'Certified' this unit. � Circuit boards inspected and found to be FREE of any potentially problematic, 'Black-Legged' transistors that we have been seeing more and more often over the past hand-full of years. � Following ext / int visual inspection entire unit was cleaned inside and out including all contacts, switches and controls. � Sluggish / stiff power switch actuator removed, disassembled, cleaned and lubed � 'Wafer' switches / selectors had their contacts burnished to remove 'sound robbing' tarnish. � Switches and controls now clean sounding and performing solidly. � Internal power supply found to be producing proper Voltages at outputs � New #25-995 power / pilot lamp installed � All functions tested for perfect operation. � All inputs tested and both side produces clean and even sine waves! � No power supply hum of any kind. It's dead silent! � Original, rear service bumpers still intact � Original, bottom feet / pads still intact � All Original, speaker input and output connectors perfectly intact � Following electronic refurb, entire unit was cosmetically detailed � RCA's all Dremel burnished / cleaned / polished � Top sheet metal plate, looks as if it may have been refinished at one point � Following service / refurb procedures, the unit was ran continuously for 72+ hours. Very quiet. All functions operating perfectly. No power supply hum electrically or machanically. Total restoration time investment 10+ hours. You will not be disappointed. Very sought after for 'Spec Racks', the classic Pioneer Spec-1 pre-amplifier. Spec-1 preamps are the heart and 1st main building block for any, proper, Pioneer SPEC rack. Made to mate up with Pioneer's Spec-2 or Spec-4 power amps (or both as it has dual outputs). Cosmetically it's in BEAUTIFUL condition with nothing really worth mentioning. All internal wiring very neatly routed and loomed. All internal potentiometers and 'Step attenuators' ALPS brand. All circuit boards very clean with no corrosion or evidence of bad or amateur re-soldering. All internal metal clean with no corrosion. Looks virtually NEW inside! From the tech notes; "VERY clean inside. Probably spent most of it's life in the western US away from humid environments". From the original brochure; "EQ and Control Amplifier both designed with 3-stage, direct-coupled, Class-A 'SEPP' with 1st stage differential amplifier". Does not appear to have every been rack mounted so no 'rack rash' around the mounting holes of the face plate. With the exception of a small area on the rack handles, none of what's becoming very common 'Pioneer Green' corrosion. Pioneer SPEC-1 Pre-Amp Features and 'Creature Comforts' include: - All internal potentiometers and 'Step attenuators' ALPS brand - Speaker Selector (we know, preamps are not supposed to have speaker selectors on them, but we'll explain how that works below) - Subsonic filter built-in for cutting turntable rumble selectable CUT-OFF at 15Hz, 30 Hz or Off - High filter for reducing tape hiss, tuner broadcast hiss, hiss from poorly recorded YouTube / TV videos or any 'electronic hiss) selectable 8kHz, 12kHz or Off - Huge fixed Resistor, De-tented volume control (no typical "dirty volume pot" to ever have to worry about). - Tone Bypass switch for purest audio signal path if so desired - 4-band Eq / Tone control using fixed resistor pre-sets. (No potentiometer tracks to get dirty and wear out) Bass centered @ 50Hz, *Mid Bass centered @ 100Hz,* *Mid-highs centered @ 10kHz,* *and Highs centered @ 20Khz.* - Pre-amp section 'Stereo / Mono' / Reverse / L/ R / L+R Stereo selector - Dual tape deck monitors (Tape Monitors can be used with Video / CD / DVD / VCR / DAT / MP3 / iPod� / iPad� / iPhone� / iTouch� / iGadget / MP3 / XM� / SIRUS� CDR (CD recorders as well as for inserting signal processors, such as EQ's, Reverbs, Spatial Enhancers / Dynamic Processors, Noise Reduction units, Special Effects units, Time Delays, etc) - Tape Duplication / Dubbing capabilities - Dual Phono / Turntable inputs w/ 'Built-in' phono pre-amps and with Phono "2" having an infinitely variable attenuator selectable from 0 to -12dB level - Tuner input (may also be used for Video / CD / DVD / LD / VCR / DAT / MP3 / iPod� / iPad� / iPhone� / iPod� / iTouch� / iGadget / eReader / MP3 / XM� / SIRUS� etc.) - DUAL AUXs input (may also be used for Video / CD / DVD / LD / VCR / DAT / MP3 / iPod� / iPhone� / iPod� / iTouch� / iGadget / eReader / MP3 / XM� / SIRUS�, audio mixers, computer sound-cards etc.) - Mic input featuring Mic Mixing control, On-Off and front located 1/4" input jack (great for DJ / Karaoke use - watch those 'Home Audio' grade speakers with an open mic) - Stereo Mode selector for Normal, Reverse & Mono - Instant volume Attenuator (Muting) selectable for 0, -15 or -30 dB (especially useful for 'fine tuning' the graduations in Volume Level as this unit is designed with a '3dB/Step' volume attenuator instead of a standard 'carbon trace pot'). - Front mounted 1/4" stereo headphone jack (only energized if speaker outputs from a power amp are connected) - Rack Mount front plate with handles (designed for standard 19" EIA racks). - Rear panel features full RCA patch bay for all inputs (each 'fastened separately' to the rear panel, and 'point to point' wired internally, instead of being soldered directly to the circuit board, which is always a 'failure point'). - Dual ground lugs - Power amp speaker connectors for A & B speaker selector and headphone use - 5 AC convenience outlets; 3x Switched and 2x un-switched AC outlets for a maximum load of 1450 Watts of external gear. - True "WORLD AC POWER"� allows unit to be operated on 50 or 60 Hz AC and will select voltages from 110v, 120v, 220v and 240 Volts AC input. Pioneer SPEC-1 Pre-Amp Original Specifications: Circuitry: "EQ and Control Amplifier both designed with 3-stage, direct-coupled, Class-A 'SEPP' with 1st stage differential amplifier". S/N (IHF): 90dB for 'non-phono' inputs THD: across 20-20kHz @ 2V output = 0.03% and @ 7V output = 0.05% Freq Response (non-phono inputs): 10Hz-70kHz at full rated power Input Sensitivities 'AUX, TUNER & TAPE' inputs for full rated output: 150mV / 100kΩ via RCA's Input Sensitivity 'Microphone' input for full rated output: 2.5mV / 50kΩ Output at Main Output: 2V-7V for 'rated output' @ 600 Ohms Output at Tape Monitors: 150mV / 2.2k Ohms via RCA's Sub Bass Control: �4.5dB @ 50Hz Bass Control: �7.5dB @ 100Hz Treble Control: �7.5dB @ 10kHz Upper Treble Control: �4.5dB @ 20kHz Low filter: @ 15Hz or 30 Hz or Off and 12dB/Oct High filter: @ 8kHz or 12kHz or Off and 12dB/Oct *Phono Section:* Freq Response: 30Hz-15kHz (Limited by RIAA EQ standards) S/N: MM= 70dB (Shorted) Phono MM Sensitivity: Phono 1; 2.5mV & 50k Ohms Phono 2; 2.5mV to 10mV & 50k Ohms Phono Maximum Input Level: Phono 1; HUGE @ 500mV @ 1kHz Phono 2; even HUGE'errr @ 500-1000mV @ 1kHz Again, as stated before, our technician has completely refurb'd this Pioneer SPEC-2 Pre-Amp, cleaning and testing all and it gets our full 'Certification'. Entire unit, including the original brushed aluminum, Face and knobs are in beautiful condition. Unit looks beautiful and sounds great. This is only the second Pioneer SPEC-2 preamp we've had in 24 years of the website and the last was in 2003. Comes with an 'e' copy / pdf download of the original Pioneer SPEC-1 Pre-Amp users manual and brochure, service manual if purchaser so desires. Also comes with it's original Pioneer SPEC-1 box and packing...and YES, the serial number on the box matches the unit!!! Measures 19" wide x 14.5" deep x 7.5" tall and weighs 24 lbs unpacked. Includes our 30 day limited warranty! Pioneer SPEC-1 Pre-Amp Cond. 8.5+++ (C) M.H. SOLD 4/5/2022 SHIPPED TO LEWIS IN GEORGIA (Above text, in it's entirety, property of www.oaktreevintage.com / Oak Tree Enterprises, LLC. See 'Copyright Information' page for details)	*NEW LISTING 9/16/2021* (click on above thumbnails to enlarge photos) warranty REFURBISHED / FULLY SERVICED & WARRANTED VINTAGE CARVER STEREO PRE-AMPLIFIER CARVER C-1 "HIGH FIDELITY CONTROL CONSOLE" SAME MODEL WE USE HERE IN OUR AUDITION / DEMO RACK W/ ORIGINAL BOX & PACKING #...8261 Circa 1981-89 SEMI "WORLD AC POWER" � MIJ SOLD 3/17/2022 SHIPPED TO ZANE IN GEORGIA � Our technician has completely gone through and 'Certified' this unit. � Following ext / int visual inspection entire unit was cleaned inside and out including all contacts, switches and controls. � Switches and controls now clean sounding and performing solidly (requires adding access ports for push switches). � Internal power supply found to be producing proper Voltages at outputs � All functions tested for perfect operation. � All inputs tested and both side produces clean and even sine waves! � No power supply hum of any kind. It's dead silent! � Original, bottom feet / pads still intact � Following electronic refurb, entire unit was cosmetically detailed � Following service / refurb procedures, the unit was ran continuously for 72+ hours. Very quiet. All functions operating perfectly. No power supply hum electrically or machanically. Total restoration time investment 3.5+ hours. You will not be disappointed. Quality CARVER C-1 pre-amplifier. Cosmetically it's in BEAUTIFUL condition with nothing really worth mentioning. CARVER C-1 Pre-Amp Features and 'Creature Comforts' include: - Sonic Holography Built-In (this was one of Bob Carvers, 'Signature' patents and were expensive when purchase separately. I sold them when new in the 1980's) (note; with "Sonic Holography" engaged, 'Balance' control has limited function) - Infrasonic (Subsonic) filter built-in for cutting turntable rumble selectable CUT-OFF at 18Hz and 12dB / OCT (rear panel switchable) - Tone Bypass switch for purest audio signal path if so desired - Separate L&R Bass and Treble Controls - 40Hz / Loudness (Bass turnover, increases effect and range of Bass controls when engaged) - 8kHz / 12kHz (Treble turnover, increases effect and range of Bass controls when engaged {and changes their 'centers'}) - Pre-amp section 'Stereo / Mono' selector - Dual tape deck monitors (Tape Monitors can be used with Video / CD / DVD / VCR / DAT / MP3 / iPod� / iPad� / iPhone� / iTouch� / iGadget / MP3 / XM� / SIRUS� CDR (CD recorders as well as for inserting signal processors, such as EQ's, Reverbs, Spatial Enhancers / Dynamic Processors, Noise Reduction units, Special Effects units, Time Delays, etc) - Bi-Directional Tape Duplication / Dubbing capabilities - Dual Phono / Turntable inputs w/ 'Built-in' phono pre-amps and with Phono "2" having a built-in 'head-amp' for moving coil cartridges (that in itself is worth a few hundred $$$ if you are utilizing a 'Moving Coil' cart) - Phono Loading for Phono #1; 0pf, 180pf or 390pf - Tuner input (may also be used for Video / CD / DVD / LD / VCR / DAT / MP3 / iPod� / iPad� / iPhone� / iPod� / iTouch� / iGadget / eReader / MP3 / XM� / SIRUS� etc.) - DUAL AUXs input (may also be used for Video / CD / DVD / LD / VCR / DAT / MP3 / iPod� / iPhone� / iPod� / iTouch� / iGadget / eReader / MP3 / XM� / SIRUS�, audio mixers, computer sound-cards etc.) - External Processor Loop for direct connection of signal processors such as reverbs, delays, EQ's, etc. (may also be used as an additional 'pre-volume' input for Video / CD / DVD / LD / VCR / DAT / MP3 / iPod� / iPhone� / iPod� / iTouch� / iGadget / eReader / MP3 / XM� / SIRUS�, audio mixers, computer sound-cards etc.) - Front mounted 1/4" stereo headphone jack (works with any 'dynamic' type headphones) - Dual outputs for driving 2 power amps or feeding other external systems; whole house, mixer, computer, etc. - 'Delayed' turn-on to the outputs mutes the signal for 3-5 seconds so that amps do not get the initial cap charging DC surge - "Speaker Off" switch disconnects main outputs - Rear panel features full RCA patch bay for all inputs - Dual ground lugs - 6X AC convenience outlets; 3x Switched @ 1000 Watts and 3x un-switched AC outlets @ 500Watts for a maximum load of 1500 Watts of external gear. - Semi "WORLD AC POWER"� allows unit to be operated on 50 or 60 Hz AC (would require a transformer for Voltage conversion). CARVER C-1 Pre-Amp Original Specifications: S/N (IHF): 96dB for 'non-phono' inputs THD: across 20-20kHz < 0.05% Freq Response (non-phono inputs): 3Hz-80kHz at full rated power Input Sensitivities 'AUX, TUNER & TAPE' inputs for full rated output: (likely) 150mV / 100kΩ via RCA's Gain thru to Main Output: 25dB for 'rated output' @ 600 Ohms Low filter: @ 18Hz & 12dB/Oct *Phono Section:* Freq Response: RIAA standards S/N: MM= 83dB w/ 5mV input MC= 77dB w/ 500uV input Phono Maximum Input Level: MM; 100mV @ 1k MC; 15mV Again, as stated before, our technician has completely refurb'd this Carver C-1 Pre-Amp, cleaning and testing all and it gets our full 'Certification'. Entire unit, including the original knobs and anodized face are in beautiful condition. Unit looks beautiful and sounds great. This is the first Carver C-1 we've offered for sale. Yes, I know a lot of you knew about one here at the shop, but it's the one we use on our 'burn-in' bench and isn't for sale. Comes with an 'e' copy / pdf download of the original CARVER C-1 Pre-Amp users manual and brochure. Also comes with it's original CARVER C-1 box and packing...and YES, the serial number on the box matches the unit!!! Measures 17.3" wide x 9" deep x 2.55" tall and weighs 7 lbs unpacked. Includes our 30 day limited warranty! CARVER C-1 Pre-Amp #...8261 Cond. 8.5+++ (C) R.R. SOLD 3/17/2022 SHIPPED TO ZANE IN GEORGIA (Above text, in it's entirety, property of www.oaktreevintage.com / Oak Tree Enterprises, LLC. See 'Copyright Information' page for details)				*NEW LISTING 10/4/2021* (click on above thumbnails to enlarge photos) warranty REFURBISHED / FULLY SERVICED & WARRANTED VINTAGE CARVER STEREO PRE-AMPLIFIER CARVER C-1 "HIGH FIDELITY CONTROL CONSOLE" SAME MODEL WE USE HERE IN OUR AUDITION / DEMO RACK #...0128 Circa 1981-89 SEMI "WORLD AC POWER" � MIJ SOLD 4/6/2022 SHIPPED TO JOHN IN CONNECTICUT � Our technician has completely gone through and 'Certified' this unit. � Following ext / int visual inspection entire unit was cleaned inside and out including all contacts, switches and controls. � Switches and controls now clean sounding and performing solidly (requires adding access ports for push switches). � Internal power supply found to be producing proper Voltages at outputs � All functions tested for perfect operation. � All inputs tested and both side produces clean and even sine waves! � No power supply hum of any kind. It's dead silent! � Original, bottom feet / pads still intact � Following electronic refurb, entire unit was cosmetically detailed � Following service / refurb procedures, the unit was ran continuously for 72+ hours. Very quiet. All functions operating perfectly. No power supply hum electrically or machanically. Total restoration time investment 4+ hours. You will not be disappointed. Quality CARVER C-1 pre-amplifier. Cosmetically it's in BEAUTIFUL condition with nothing really worth mentioning. CARVER C-1 Pre-Amp Features and 'Creature Comforts' include: - Sonic Holography Built-In (this was one of Bob Carvers, 'Signature' patents and were expensive when purchase separately. I sold them when new in the 1980's) (note; with "Sonic Holography" engaged, 'Balance' control has limited function) - Infrasonic (Subsonic) filter built-in for cutting turntable rumble selectable CUT-OFF at 18Hz and 12dB / OCT (rear panel switchable) - Tone Bypass switch for purest audio signal path if so desired - Separate L&R Bass and Treble Controls - 40Hz / Loudness (Bass turnover, increases effect and range of Bass controls when engaged) - 8kHz / 12kHz (Treble turnover, increases effect and range of Bass controls when engaged {and changes their 'centers'}) - Pre-amp section 'Stereo / Mono' selector - Dual tape deck monitors (Tape Monitors can be used with Video / CD / DVD / VCR / DAT / MP3 / iPod� / iPad� / iPhone� / iTouch� / iGadget / MP3 / XM� / SIRUS� CDR (CD recorders as well as for inserting signal processors, such as EQ's, Reverbs, Spatial Enhancers / Dynamic Processors, Noise Reduction units, Special Effects units, Time Delays, etc) - Bi-Directional Tape Duplication / Dubbing capabilities - Dual Phono / Turntable inputs w/ 'Built-in' phono pre-amps and with Phono "2" having a built-in 'head-amp' for moving coil cartridges (that in itself is worth a few hundred $$$ if you are utilizing a 'Moving Coil' cart) - Phono Loading for Phono #1; 0pf, 180pf or 390pf - Tuner input (may also be used for Video / CD / DVD / LD / VCR / DAT / MP3 / iPod� / iPad� / iPhone� / iPod� / iTouch� / iGadget / eReader / MP3 / XM� / SIRUS� etc.) - DUAL AUXs input (may also be used for Video / CD / DVD / LD / VCR / DAT / MP3 / iPod� / iPhone� / iPod� / iTouch� / iGadget / eReader / MP3 / XM� / SIRUS�, audio mixers, computer sound-cards etc.) - External Processor Loop for direct connection of signal processors such as reverbs, delays, EQ's, etc. (may also be used as an additional 'pre-volume' input for Video / CD / DVD / LD / VCR / DAT / MP3 / iPod� / iPhone� / iPod� / iTouch� / iGadget / eReader / MP3 / XM� / SIRUS�, audio mixers, computer sound-cards etc.) - Front mounted 1/4" stereo headphone jack (works with any 'dynamic' type headphones) - Dual outputs for driving 2 power amps or feeding other external systems; whole house, mixer, computer, etc. - 'Delayed' turn-on to the outputs mutes the signal for 3-5 seconds so that amps do not get the initial cap charging DC surge - "Speaker Off" switch disconnects main outputs - Rear panel features full RCA patch bay for all inputs - Dual ground lugs - 6X AC convenience outlets; 3x Switched @ 1000 Watts and 3x un-switched AC outlets @ 500Watts for a maximum load of 1500 Watts of external gear. - Semi "WORLD AC POWER"� allows unit to be operated on 50 or 60 Hz AC (would require a transformer for Voltage conversion). CARVER C-1 Pre-Amp Original Specifications: S/N (IHF): 96dB for 'non-phono' inputs THD: across 20-20kHz < 0.05% Freq Response (non-phono inputs): 3Hz-80kHz at full rated power Input Sensitivities 'AUX, TUNER & TAPE' inputs for full rated output: (likely) 150mV / 100kΩ via RCA's Gain thru to Main Output: 25dB for 'rated output' @ 600 Ohms Low filter: @ 18Hz & 12dB/Oct *Phono Section:* Freq Response: RIAA standards S/N: MM= 83dB w/ 5mV input MC= 77dB w/ 500uV input Phono Maximum Input Level: MM; 100mV @ 1k MC; 15mV Again, as stated before, our technician has completely refurb'd this Carver C-1 Pre-Amp, cleaning and testing all and it gets our full 'Certification'. About the only cosmetic issue worth mentioning is that it appears that the volume knob has been refinished at some point. Overall, the unit, including the original knobs and anodized face are in great condition. Unit looks good and sounds great. This is the second Carver C-1 we've offered for sale. Yes, I know a lot of you knew about one here at the shop, but it's the one we use on our 'burn-in' bench and isn't for sale. Comes with an 'e' copy / pdf download of the original CARVER C-1 Pre-Amp users manual and brochure. Measures 17.3" wide x 9" deep x 2.55" tall and weighs 7 lbs unpacked. Includes our 30 day limited warranty! CARVER C-1 Pre-Amp #...0128 Cond. 8.5+ (C) R.R. SOLD 4/6/2022 SHIPPED TO JOHN IN CONNECTICUT (Above text, in it's entirety, property of www.oaktreevintage.com / Oak Tree Enterprises, LLC. See 'Copyright Information' page for details)
*NEW LISTING 5/1/19* (Click on above thumbnails to enlarge photos) warranty REFURBISHED / FULLY SERVICED & WARRANTED VINTAGE PIONEER STEREO INTEGRATED AMPLIFIER PIONEER SA-6500-II / SA6500-II #...352F Circa 1977-79 MIJ SOLD 3/1/2021 SHIPPED TO KEN IN FLORIDA � Our technician has completely gone through and 'Certified' this unit. � Everything was cleaned inside and out including all switches, controls and contacts. Cleaned and re-lubed all control shafts. � Internal fuses checked for correct value / function and replaced where necessary. � Input function switch replaced as the original had intermittent issues � Headphone circuit board repaired as one channel was in-op. � Solder joints reflowed on probable high heat and high stress points � New AC Power / Pilot lamp installed � Amplifier section had output bias and DC offset checked to acceptable levels after 10 min warm-up. � All functions tested for perfect operation. � Following above procedures, unit was cosmetically detailed inside and out. � All inputs tested and both sides produce clean and even sine waves into static 8 & 4 ohm loads! No power supply hum of any kind. It's dead silent! � Following restoration procedures, the unit was run continuously at medium volume, as all our amplifier / receivers are, into a load with "Loudness" on and both Tone Controls at 10 for 48 hours. (Technicians note, "this is a very 'tech friendly & serviceable' amplifier design") Total tech time 6+ hours. On our test bench the internal amplifiers of this particular unit, #...352F, produced 18+ Volts per channel at 8 Ohms for 40+ Watts per channel and 14+ Volts at 4 Ohms for 49+ Watts per channel via discrete outputs (2x NEC 2SB616A & 2x NEC 2SD586) Idle 'Mains' current draw 0.1A. Floor noise measured @ >-60dBm. ____________________________ Great performing and 'classic' looking Pioneer Integrated Amplifier. The Pioneer SA-6500. This is the first of this model we've had. Great unit to provide the basis of a medium to medium large sized Hi-Fi system or 'project home studio'. Following the above refurb / service work, the unit now works well and sounds great! Pioneer SA-6500-II Features include: - Discrete Amplifier Output design - Speaker A, B Off selector - Separate Bass and Treble controls featuring high-quality, de-tented controls - "Tone" switch to bypass tone controls for purest, most un-adulterated signal path - "Loudness" function to boost Bass and Treble in relationship to Mid frequencies at lower volume levels for a much fuller sound. - Dual tape deck monitors (Tape Monitors can be used with Tape decks such as Cassette Tape Recorders/ Players, Reel to Reel's, 8-Track Tape Cartridge Decks, Video / CD / DVD / VCR / DAT / MP3 / iPod� / iPad� / iPhone� / iTouch� / iGadget / MP3 / XM� / SIRIUS� CDR (CD recorders as well as for inserting signal processors, such as EQ's, Reverbs, Spatial Enhancers / Dynamic Processors, Noise Reduction units, Special Effects units, Time Delays, etc) - Tape Dubbing 1->2 Capability - Phono / Turntable input with Built-In Phono Pre-Amp - AUX Input (may also be used for Video / CD / DVD / LD / VCR / DAT / MP3 / iPod� / iPad� / iPhone� / iPod� / iTouch� / iGadget / eReader / MP3 / XM� / SIRIUS� etc.) - Tuner input (may also be used for Video / CD / DVD / LD / VCR / DAT / MP3 / iPod� / iPad� / iPhone� / iPod� / iTouch� / iGadget / eReader / MP3 / XM� / SIRIUS� etc.) - 1/4" stereo headphone jack - Spring loaded, 'Push'' speaker outputs - Quad AC Convenience outlets (2 switched and 2 un-switched) with a total capacity of 400 Watts Pioneer SA-6500-II Original Specs: "Continuous Power Ouput is 30 Watts / Ch. min RMS, @ 8 Ohms or 30 Watts / Ch @ 4 Ohms from 20-20kHz w/ < 0.1% THD." Design type: 2 Channel, discrete output Damping Factor @ 1kHz / 8Ω & 20-20kHz: 30 THD; 0.1% at full rated power (30W + 30W) into 8Ω w/ 20-20kHz Potential Frequency Response @1W: 10-40kHz +/-0dB S/N: 93dB for Tuner, Tape and AUX inputs Bass Control: +9dB /-8dB @ 100Hz Treble Control: +8dB /-6dB dB @ 10kHz Loudness Control: +8dB @ 100Hz & +5dB @ 10kHz (-40dB Vol Level) *Input Sensitivities:* Non-Phono inputs = 150mV / 50kΩ Non-Phono *Inputs:* 150mV / 50kΩ *Tape outputs:* 150mV / 50kΩ PHONO SECTION SPECS: Freq Response: 20Hz-20kHz w/ RIAA Equalization of �0.3dB S/N: >72dB Input Sensitivity: 2.5mV @ 50kΩ Phono Overload: 200mV From the original Pioneer SA-6500-II Brochure; "Bass Frequencies Sweet and Clean. The many refinements in the SA-6500-II include a constant-current load construction in the 'pre-driver' stage of the power amplifier. This helps eliminate a time constant at low frequency so that sound quality remains un-muddied and sweet over the whole audible spectrum....Further the power output is enhanced with a power supply using a larger transformer and a pair of 6,800uF, Electrolytic Capacitors for excellent Voltage Regulation so that low-range dynamics never suffer power drain" (means tighter, deeper and 'thumpier' bass!) Again, we have completely gone through the unit cleaning all contacts, pots, switches and controls as mentioned above. All functions test as original. Simple to use. Unit performs and sounds great! Other than a few typical, light scuffs / striations on the sheet metal bonnet, nothing really worth mentioning cosmetically. Unit looks great! Comes with an 'e-copy', PDF download of the Pioneer SA-6500-II owners / users / instruction manual, brochure and the service manual if the purchaser desires. Measures 15" wide x 12.25" deep x 5.5" tall and weighs 17 lbs unpacked. Comes with original owners manual and includes our 30 day limited warranty. Condition 8.5 PIONEER SA-6500-II SOLD 3/1/2021 SHIPPED TO KEN IN FLORIDA (Cons. M.H.) (Above text, in it's entirety, property of www.oaktreevintage.com / Oak Tree Enterprises, LLC. See 'Copyright Information' page for details)	*NEW LISTING* 12/22/2021 (Click on above thumbnails to enlarge photos) warranty VINTAGE REALISTIC STEREO INTEGRATED AMPLIFIER REALISTIC SA-2001 TO-3 METAL CASED OUTPUTS! #...0222 Circa 1978-79 MADE IN JAPAN (Not Taiwan or Korea like a lot of 'vintage' Realistic gear) SOLD 1/6/2022 SHIPPED TO SEAN IN GEORGIA � Our technician has completely gone through and 'Certified' this unit. � Following ext / int visual inspection entire unit was cleaned inside and out � All three 'control' PCB's removed to allow cleaning of ALL contacts, switches and control pots. � Bias adjusted to correct spec (SM calls for 5-14mVDC. Adjusted to 10mV). � DC Offset adjusted within spec @ 55mVDC L & R. � Switches and controls now clean sounding and performing solidly (switches require 'access ports' drilled to clean) � Split bisecting the speaker outputs', phenolic resin board, addressed with an epoxied ABS sheet. � All functions tested for perfect operation. � All inputs tested and both side produces clean and even sine waves! � No power supply hum of any kind. It's dead silent! � Following electronic refurb, entire unit was cosmetically detailed (It's BEAUTIFUL!!!) This is first and only one Realistic SA-2001 we've had in 23 years. Very elegant, brushed aluminum face plate with the original aluminum knobs. Following 8+ hours of restoration procedures, the unit was ran continuously at medium volume, as all our amplifier / receivers are, into a 4 Ohm load with "Loudness" on and both Tone Controls at 10 for 48 hours. Total technician time to restore 8 hours. (Tech noted on work sheet, "VERY nice build quality inside and out. Mint condition") On our test bench the internal amplifiers of this particular unit, #...0222, produced 22 Volts per channel at 8 ohms for 60 Watts per channel and 20 Volts at 4 ohms for 100 Watts per channel via discrete, TO-3 / Metal Cased outputs (Sanken 2SC1116) (test at 1kHz, single channel at a time). Idle current draw 0.3A. Very quiet with Floor noise measured @ >74dBm. ____________________________ According to an original catalog, "Our finest amplifier ever! For those who demand maximum control over their system, it has tuner, aux and two phono inputs, plus dubbing and monitoring facilities for two tape decks. In addition, you get the loudness compensation system so highly acclaimed by a major audio magazine! Exclusive Perfect Level" makes our Perfect Loudness system adjustable to any listening level so that the "boominess" so often heard with ordinary loudness systems is eliminated" It actually was their 'top of the line' integrated amp ever. After 1979, they did no more integrated amps above a few Watts known as their "Mini" systems. This was the 'TOPL' Integrated amp Realistic ever did (and the last of their 'real' component amps. After that they went to their 'micro/ mini' series with just a few Watts). VERY elegant looking unit, with a classy, brushed aluminum face, and a 'REAL' wood veneer bonnet. This is the first one we've had in 24+ years of having the website. Just the right features & sonically magnificent! Great amp for home or project recording studio use. Realistic SA-2001 Integrated Amplifier Features and 'Creature Comforts' include: - Discrete output power amplifier section w/ ample heat sinks - Beefy Power supply - "Perfect Loudness" control couples 'gain' and 'Volume' controls allow you to adjust loudness compensation to your exact preference (similar to Yamaha's Variable Loudness). - Speaker selector for Main or Remote, A+B or Off - Separate Bass, Mid and Treble with high quality de-tented controls - Selectable Tone Control turnover centers Low-Freq: 400Hz or 125Hz Hi-Freq: 3kHz or 7kHz - "Perfect Loudness" function w/ 'Variable Preset Level' (boosts EQ on Bass and Treble, while cutting mids for a fuller sound at lower volume levels in relationship with the 'Volume' controls) - Dual Analog, back lit, 'd'Arsonval' movement, VU Power Meters - 'Stereo / Mono' selector - Built-in Low / Subsonic Filter to eliminate excess rumble from sources such as turntables - Hi filter for reducing tape hiss / electronic hiss & noise- and record static - Dual Tape Monitor Loops (Tape Monitors can be used with Video / CD / DVD / VCR / DAT / MP3 / iPod� / iPad� / iPhone� / iTouch� / iGadget / MP3 / XM� / SIRUS� CDR (CD recorders as well as for inserting signal processors, such as EQ's, Reverbs, Spatial Enhancers / Dynamic Processors, Noise Reduction units, Special Effects units, Time Delays, etc) - Bi-Directional Dubbing (allows signal flow / copying from Tape-1 to Tape-2 or Tape-2 to Tape-1) - Dual 'Magnetic' Phono / Turntable inputs w/ 'Built-in' phono pre-amp - Tuner input (may also be used for Video / CD / DVD / LD / VCR / DAT / MP3 / iPod� / iPad� / iPhone� / iPod� / iTouch� / iGadget / eReader / MP3 / XM� / SIRUS� etc.) - AUX input (may also be used for Video / CD / DVD / LD / VCR / DAT / MP3 / iPod� / iPhone� / iPod� / iTouch� / iGadget / eReader / MP3 / XM� / SIRUS�, audio mixers, computer sound-cards etc.) - Pre-Amp / Power Amp loop (allows Pre-amp to feed others systems / amplifiers or other pre-amps / mixers to feed power amp separately. This can be one of the handiest features of a receiver / integrated amplifier, and is typically only found on a brands 'mid-upper' to 'upper-end' models) - Front mounted 1/4" stereo headphone jack - Back panel features full RCA patch bay for all inputs (each 'fastened separately' to the rear panel, and 'point to point' wired internally, instead of being soldered directly to the circuit board, which is always a 'failure point'). - 'Screw Type' speaker connectors for A&B speakers (also gives a pair of RCA connectors for speakers) - Dual convenience AC outlets; 1 Switched @ 100 Watts and 1 un-switched @ 200 Watts for a maximum load of 300 Watts of external gear. Realistic SA-2001 Original Specifications: "Continuous Power output of 60 Watts per channel @ 8 Ohms 20Hz to 20kHz @ <0.2%THD. (Dynamic Power is much more!!!) Design type: 2 Channels, Integrated Pre / Class AB operation Power Amplifier Power Output: Continuous power output, 20Hz-20,000Hz; 60 W/Ch. THD; 0.2% @ 8 Ohms Freq Response: 20Hz-20kHz at full rated power S/N: 85dB @ AUX (10dB more than the previous years model!!!!) Lo Filter: -8dB @ 18Hz Hi Filter: -6dB @ 10kHz Loudness Control: +10dB @ 50Hz & +7dB & 10kHz (-30dB Vol Level) Input Imp at AUX or Tape: 50k Ohms Channel Separation @ AUX or Tape: 50dB Tape Output (Rec) Level w/ 3mV Phono Input: 200 mV Phono Section: Freq Response: 20Hz-20kHz (30-15kzHz RIAA EQ) S/N: 70dB @ PHONO *(10dB more than the previous years model!!* Phono MM Sensitivity: 1.5/3/6mV (switchable) Phono Overload: 150-200mV Input Imp: 47k Ohms Again, as stated before, our technician has completely refurb'd this Realistic SA-2001 Integrated Stereo Amplifier, cleaning and testing all and it gets our full 'Certification'. Entire unit, including the original brushed aluminum, Face and knobs are in beautiful condition. Cosmetically, with the exception of some minor 'tics' on the face, and along the top 'side edge' of the wood case and a few, old scratches from other gear sitting on top in the past (only really noticeable when looking 'down from above' the unit. Lemon oil pretty much hides them from being distracting) the tuner looks great (see photos above). Unit looks beautiful and sounds great with what the restoration tech called "Gutsy" power & punch! (Authors / Owner of OTV note; This is one of the best looking integrated amps {and tuners} we've come across in over 4 decades of dealing in audio gear. If it were mine and not a consignment pair, I wouldn't be selling it!) Includes a pdf, e-copy download of the Realistic SA-2001 owners / users / instruction manual. Measures 16.2" wide x 12" deep x 5.75" tall and weighs 22 lbs unpacked. Includes our 30 day limited warranty! REALISTIC SA-2001 INTEGRATED AMP Cond. 8.5 with matching TM-1001 tuner (C) R.R. SOLD 2/6/2022 SHIPPED TO SEAN IN GEORGIA (Above text, in it's entirety, property of www.oaktreevintage.com / Oak Tree Enterprises, LLC. See 'Copyright Information' page for details)				*NEW LISTING 9/1/2021* (click on above thumbnails to enlarge photos) warranty REFURBISHED / FULLY SERVICED / WARRANTED VINTAGE MARANTZ STEREO INTEGRATED AMPLIFIER (CONSOLE AMPLIFIER) CLASSIC MARANTZ 1090 #...0314 MIJ Circa 1976-78 SOLD 2/25/2022 SHIPPED TO DARRYL IN OREGON � Our technician has completely gone through and 'Certified' this unit. � Everything was cleaned inside and out including all switches, controls and contacts. Cleaned and re-lubed all control shafts. Access ports created on push switches. ('Balance' control still has slight noise when manipulated after multiple cleaning). � Replaced missing line fuse w/ correct value � Intermittent power issue tracked down to bad solder joint found and repaired at transformer primary input � Solder joints reflowed on all possible high heat and stress points � All circuit boards inspected for any 'black legged' devices and none found � Removed semi-conductors from heat sinks and old, crusty heat sink compound replaced on outputs and voltage rectifiers / regulators � Amplifier section had output bias and DC offset checked to spec levels after 10 min warm-up. � All functions tested for perfect operation. � Following above procedures, unit was cosmetically detailed inside and out. � Walnut wood veneer cabinet had structural issues addressed as well as loose veneer sections. Following that, had a fresh coat of lemon oil applied. Looks beautiful. � All inputs tested and both sides produce clean and even sine waves into static 8 & 4 ohm loads! No power supply hum of any kind. It's dead silent! � Following restoration procedures, the unit was run continuously at medium volume, as all our amplifier / receivers are, into a load with "Loudness" on and both Tone Controls at 10 for 72+ hours. (Technicians note, "this is a fairly 'tech friendly & serviceable' amplifier design") Total tech time 9 hours. On our test bench, each internal amplifier of this particular unit, #...0314, produced peak power of 23.5 Volts per channel at 8 ohms for 69 Watts per channel and 19.8 Volts at 4 ohms for 98 Watts per channel via discrete output transistors @ 1kHz. Bias set to proper 12mA at emmiters. DC offset set to no greater than 23mVDC either channel. AC Idle current at 200mA. Floor noise >-56dBu. ____________________________ This is the first Marantz 1090 we've had in almost 3 decades (really "ever")! BEAUTIFUL Brushed Aluminum Face surrounded by originally optional Walnut cabinet. Marantz 1090 Stereo Integrated Amplifier looks and sounds great! Great amp for 2-channel stereo systems up to medium-large and "recording studio" use. "Real" output transistors and substantial power supply! Just a great 'all-around utility' amplifier for probably more than 80% of the audio systems out there. Marantz 1090 Features include: - Real Class A/B amplifier architecture - A or B of OFF speaker select - Super quality volume control - 3-Band, Graphic EQ, w/ Separate Bass, Mid and Treble with high quality de-tented controls - �EQ / Tone Defeat� for purest signal path and most un-adulterated sound - Dual tape monitors (Tape Monitors can be used with Tape decks such as Cassette Tape Recorders/ Players, Reel to Reel's, 8-Track Tape Cartridge Decks, Video / CD / DVD / VCR / DAT / MP3 / iPod� / iPad� / iPhone� / iTouch� / iGadget / MP3 / XM� / SIRIUS� CDR (CD recorders as well as for inserting signal processors, such as EQ's, Reverbs, Spatial Enhancers / Dynamic Processors, Noise Reduction units, Special Effects units, Time Delays, etc) - Tape Dubbing capability - Dual Phono / Turntable inputs w/ built-in Phono Pre-Amps - Tuner input (can also be used for ( Video / CD / DVD / VCR / DAT / MP3 / iPod� / iPhone� / iTouch� / iGadget / MP3 / XM� / SIRIUS� etc. inputs) - AUX input (can also be used for ( Video / CD / DVD / VCR / DAT / MP3 / iPod� / iPhone� / iTouch� / iGadget / MP3 / XM� / SIRIUS� etc. inputs) - Loudness function to increase �fullness� of sound at lower volume levels by accentuating the Lower and Upper frequencies relative to the mid range. - Built-in High filter for reducing 19 kHz FM pilot tones and tape hiss and AM noise - Pre-out / Main-in loop (allows feed to an additional / larger power amp, or to 'direct feed' the power-amp in the receiver with another pre-amp or audio mixer) - Stereo / Mono Selector - Front mounted �" stereo headphone jack - Back panel features full RCA patch bay for all inputs. Spring-loaded, Push type speaker connectors for A&B and Quad AC convenience outlets 2x Switched and 2x un-switched AC outlets for a maximum load of 500 Watts of external gear. Marantz 1090 Specifications: Output: Continuous 45 Watts per channel, min. RMS, @ 8 Ohms & 57 Watts per channel, min. RMS, @ 4 Ohms, both channels driven, from 20Hz to 20kHz. Power Band Freq Response: 20Hz-20kHz Design type: 2 Channels, Integrated Pre / Class A/B operation Power Amplifier Damping Factor: >45@ 20Hz into 8Ω THD and IMD: 0.1% at full rated power into 8Ω w/ 20-20kHz Freq Response of Pre-amp: 20Hz-20kHz S/N: 110dB @ "Main-In" @ 88dB on Pre Bass Control: �12dB @ 50Hz (taken from 1250 OM) Mid Control: �12dB @ 700Hz (taken from 1250 OM) Treble Control: �12dB @ 15kHz (taken from 1250 OM) High Filter: -12dB / oct @ 9kHz (taken from 1250 OM) Loudness Control: +6-8dB @ 100Hz (-30dB Vol Level) ('assumed' as this is typical rating from other units) Input Sensitivities (Non-Phono): 180mV / 25kΩ Pre outputs: 1.5V w/ 180mV @ AUX with a max of 4.2V w/ 500mV at input Output Impedances: Tape Out 300Ω, Pre Out 200Ω PHONO SECTION SPECS: Freq Response: RIAA standard w/ RIAA Equalization of �0.3dB or 20Hz-20kHz S/N: >78dB Dynamic Range: >96dB Input Sensitivity: 1.8mV @ 47kΩ (works VERY well with most MM cartridges) Phono Overload: 100mV @ 1kHz This is a very 'musical' sounding integrated amplifier. Very 'punchy' with great detail across the audio spectrum. You can really appreciate the 'discrete' outputs over more modern amplifier architecture with 'chip / STK / Darlington' type outputs, or as my tech wrote on the service work sheets, "Clean, symmetrical Sine waves. Well balanced output signals left and right...Great Old School sound...Old School Serviceability". Again as stated earlier, the Amp has had our standard FULL SERVICE inside and out including cleaning all control pots and contacts, replacing any necessary parts, and completely tested. All functions have been tested and passed with flying colors! Face and knobs are in excellent condition with only a few, very minor striations. Real, Walnut wood veneer cabinet also in fabulous shape. Unit looks and sounds great! Includes pdf download of Marantz 1060 owners / users / instruction manual (as the OM for the 1090 seems to be 'un-obtainium'). Measures 18" wide x 14.25" deep x 6.25" tall and weighs 27 lbs unpacked. Includes our 90-day limited warranty! MARANTZ 1090 Cond. 8.5+ SOLD 2/25/2022 SHIPPED TO DARRYL IN OREGON (Above text, in it's entirety, property of www.oaktreevintage.com / Oak Tree Enterprises, LLC. See 'Copyright Information' page for details)
NEW ADDITION 5/21/18 (Click on above thumbnails to enlarge photos) warranty REFURBISHED / FULLY SERVICED VINTAGE FISHER INTEGRATED POWER AMPLIFIER FISHER CA-271 (CA-1271) FISHER "STUDIO STANDARD" STEREO INTEGRATED AMPLIFIER #...8505 Circa late 1980's MIJ SOLD 12/10/20 SHIPPED TO RAY IN TEXAS � Our technician has completely gone through and 'Certified' this unit. � Following both internal and external visual inspection, the entire unit was cleaned out including all contacts, switches and controls. Switches now clean sounding and performing fine. � Silicone heat sink compound inspected for �suppleness� � Output section bias / DC offset adjusted to factory spec. � Solder joints reflowed on all possible high heat and stress points � 'Meter' illumination bulbs replaced with new, and balance of indicators checked � All functions tested for perfect operation. � All inputs and functions tested. � Both amplifier sides produce clean and even sine waves! No power supply hum of any kind. It's dead silent! � Following electronic refurbishing, the entire unit was cosmetically detailed � Following restoration procedures, the unit was ran continuously at medium volume, as all our amplifier / receivers are, into a 4 Ohm load with "Loudness" on and both Tone Controls at 10 for 48 hours. On our test bench, each internal amplifier of this particular unit, #...8451, produced peak power of 34 Volts @ 8Ω per channel for 144 Watts / channel and 28 Volts @ 4Ω per channel 196 Watts / channel via 4 discrete, Toshiba output devices at 1khz. (2x 2SA-1095 & 2X 2SC2565). AC Idle current at .5A. DC offset adjusted to <.5mV!!! L&R. Floor noise <0.1mVAC. ____________________________ We've had three of these, and got over 'being surprised' by their performance. This Fisher CA-271, Integrated Amplifier was a 'sleeper' when we originally acquired it. We thought they were too 'recent' to bother with, but then we did our preliminary tests and quickly changed our opinion. Once our tech got finished with it, we were thoroughly surprised and impressed. They always have a lot of punch and headroom (check our bench test results above against it's original specs) and are VERY MUSICAL sounding. Large internal power supply, relative to most amps in it's range. Unit looks good with minor, typical wear, mostly to edges. Nothing distracting. ____________________________ Fisher CA-271Features include: - 5-Band, 'Graphic' EQ with centers as follows: 63Hz, 250Hz, 1kHz, 4kHz, and 16kHz. - Independent speaker selector switches for A, B, A+B, Off - Tuner input (can also be used for ( Video / CD / DVD / VCR / DAT / MP3 / iPod� / iPhone� / iTouch� / iGadget / MP3 / XM� / SIRIUS� etc. inputs) - Phono / Turntable input with Built-In Phono Pre-Amp - Tape-1 monitor (can be used with Tape decks such as Cassette Tape Recorders/ Players, Reel to Reel's, 8-Track Tape Cartridge Decks, Video / CD / DVD / VCR / DAT / MP3 / iPod� / iPad� / iPhone� / iTouch� / iGadget / MP3 / XM� / SIRUS� CDR {CD recorders} ) BUT since �TAPE-1� is a �Tape Input� and not a �Tape Monitor / Loop� it CANNOT BE USED for inserting signal processors, such as EQ's, Reverbs, Spatial Enhancers / Dynamic Processors, Noise Reduction units, Special Effects units, Time Delays, etc) - Aux / �Video Sound� input (can be used with Tape decks such as Cassette Tape Recorders/ Players, Reel to Reel's, 8-Track Tape Cartridge Decks, Video / CD / DVD / VCR / DAT / MP3 / iPod� / iPad� / iPhone� / iTouch� / iGadget / MP3 / XM� / SIRUS�) - 'CD� input (can be used with Tape decks such as Cassette Tape Recorders/ Players, Reel to Reel's, 8-Track Tape Cartridge Decks, Video / CD / DVD / VCR / DAT / MP3 / iPod� / iPad� / iPhone� / iTouch� / iGadget / MP3 / XM� / SIRUS�) - Loudness for enhancing Bass and Treble response at lower volume levels - Dual 7-Segment, LED Level Meters - Meter Range Selector - 2-Pin, DC power output for other Fisher components from that series that was 'proprietary'. - Front mounted, ��, Stereo headphone jack Original FISHER CA-271 Specifications: *AMP SPECIFICATIONS:* Power output: 100WPC min RMS @ 8 Ohms & no more than 0.05% THD @ 20-20kHz THD: <0.05% @ full rated power IHF IMD: 0.05% @ full rated power & 8 Ohms Freq Response of power amp section: 20Hz to 20kHz w/ deviation of �0.2dB Damping factor: >20 @ 8Ω / 1kHz Signal to noise ratio: 90dB (line) Input sensitivity - Phono / All Others: 2.5mV (MM) / 150mV (all at 50kΩ) EQ with centers as follows: 63Hz, 250Hz, 1kHz, 4kHz, and 16kHz. Loudness Control: +8dB @ 100Hz and +4dB @10kHz *Max Power Consumption:* 480 Watts PHONO SECTION SPECS: Freq Response: 20Hz-20kHz w/ RIAA deviation of �0.2dB S/N: >70dB Input Sensitivity: 2.5mV @ 50kΩ Phono Overload: 125mV Again, we have done the previously stated refurbishment / restoration work on this unit to insure it's performance, and it gets our full 'Certification'. All functions tested for perfect operation. Performs and sounds great! This unit will also supply power to many 'proprietary Fisher' units from this series, such as Fisher Tuners and Cassette Decks. We can include an 'e' copy, PDF of the Fisher CA-271 / CA-1271 Service manual if the purchaser wishes. Measures 17.25" wide x 4.25" tall x 10.5" deep and weighs an impressive 20 lbs unpacked. Includes our standard 30 day limited warranty. Cond. 8.5 FISHER CA-271 INTEGRATED AMPLIFIER SOLD 12/10/20 SHIPPED TO RAY IN TEXAS (Above text, in it's entirety, property of www.oaktreevintage.com / Oak Tree Enterprises, LLC. See 'Copyright Information' page for details)	*NEW LISTING 4/15/20* (Click on above thumbnails to enlarge photos) warranty REFURBISHED / FULLY SERVICED & WARRANTED YAMAHA STEREO POWER AMPLIFIER YAMAHA M-45 #...280Q Circa 1986 "WORLD AC POWER" � MIJ SOLD 4/20/20 SHIPPED TO BENJAMIN IN NEW MEXICO Our technician has completely gone through and 'Certified' this unit. This unit has had complete service which encompassed cleaning everything, including both input attenuators. We also disassembled speaker output circuit board, repaired it and re-soldered both banks of speaker output binding posts and input jacks. All meter illumination LED's functioning. Inputs tested and both side produces clean and even sine waves into static 8 & 4 ohm loads! No power supply hum of any kind. It's dead silent! All functions test fine. Following restoration procedures, the unit was ran continuously at medium volume, as all our amplifier / receivers are, into a load for 48 hours. On our test bench the internal amplifiers of this particular unit (#...280Q) produced peak power of 35.5 Volts per channel for 157 Watts per channel at 8 Ohms and 32 Volts at 4 Ohms for 256 Watts per channel via discrete outputs @ 1khz. (4x 2SA1265 & 4x 2SC3182 discrete output transistors. (DC measured at -4.3mv left and -1.1mv right) ________________________________________ Great, late 1980's model power amp by Yamaha. The Model M-45. BIG power output! Excellent for 2-channel (stereo) audio listening or for use in an A/V system to power additional Front or Rear channel speakers. Enough power to also work as a project recording studio / band practice power amp as they are more stable at lower impedances than most (if used professionally, would be advisable to use a cooling fan). Lots of punch and headroom. I was a Yamaha dealer when this model was current and made lots of very happy Yamaha power amp owners with this model and it's flanking siblings. Yamaha M-45 Features: - Class "A/B" or " Auto-Class A" selectable modes - 2- Channel stereo operation - A / B speaker selector via high current relay - Dual, Vertical, 10-Segment LED Power Output Meters - Built-in Protection circuits - 24 Karat Gold plated input jacks to remain corrosion free, thus insuring the best audio signal transfer. - Oversize power supply transformer with dual 22,000 uf / 69-Volt filter caps built by Nichicon exclusively for Yamaha, and heavy duty bridge rectifier with oversize heat sink - Dual, vertically finned, unfinished aluminum, internal heat sinks for very efficient heat transfer / evacuation and completely vented from bottom thru top for maximum cooling (all electronics manufacturers should do this as well) - True "WORLD AC POWER"� allows unit to be operated on 50 or 60 Hz AC and will select voltages from 110v, 120v, 220v and 240 Volts AC input. - Rear-mounted AC convenience outlet with a capacity of 200 Watts Yamaha M-45 Original Specs: Design type: 2 Channels Rated RMS Output: 125 Watts per channel, min. RMS, at 8 Ohms, both channels driven, from 20Hz to 20kHz. 180 Watts RMS continuous @ 4 Ohms @ spec - Max dynamic power output up to 390 Watts per channel @ 2 Ohms Dynamic Headroom: 1.3dB @ 8 Ohms & 2+dB @ 4 Ohms Damping Factor: @ 1kHz / 8Ω: >70 Signal / Noise: >123dB!!! THD; 0.003% at full rated power (125w) into 8Ω w/ 20-20kHz Power Bandwidth: 10Hz-60kHz @ 8Ω Input Sensitivity: 1.1V Channel Separation: 89dB @ 1k (Vol -30dB) Again, we have completely gone through this Yamaha M-45, stereo power amp. It is in fabulous cosmetic condition. Very little visible wear. Works and sounds great! Includes an 'e-copy' pdf download of the Yamaha M-45 owners / users / instruction manual if the purchaser desires. Unit measures 17.25" wide x 16" deep x 6.5" high and weighs 28 lbs unpacked. Includes our standard 30 day limited warranty. SERVICED YAMAHA M-45 Condition 8.5++ (C) R.R. SOLD 4/20/20 SHIPPED TO BENJAMIN IN NEW MEXICO (Above text, in it's entirety, property of www.oaktreevintage.com / Oak Tree Enterprises, LLC. See 'Copyright Information' page for details) archived				NEW ADDITION *8/16/19* (Click on above thumbnails to enlarge photos) warranty REFURBISHED / FULLY SERVICED & WARRANTED OLD-SCHOOL, 2-CHANNEL STEREO VINTAGE KENWOOD STEREO INTEGRATED AMPLIFIER KENWOOD KA-501 / KA501 #...5479 Circa 1980-84 MIJ *SOLD 4/23/20* SHIPPED *TO ROBERT IN OHIO* � Our technician has completely gone through and 'Certified' this unit. � Everything was cleaned inside and out including all switches, controls and contacts. � Internal fuses checked for correct value / function and replaced where necessary (actually replaced a couple �incorrect� values). � Solder joints reflowed on all possible high heat and stress points � Amplifier section had output bias and DC offset checked to spec levels after 10 min warm-up. � All functions tested for perfect operation. � Following above procedures, unit was cosmetically detailed inside and out. � Power meter illumination lamps in working condition � All inputs tested and both sides produce clean and even sine waves into static 8 & 4 ohm loads! No power supply hum of any kind. It's dead silent! � Following restoration procedures, the unit was run continuously at medium volume, as all our amplifier / receivers are, into a load with "Loudness" on and both Tone Controls at 10 for 48 hours. Total tech time 6.5+ hours. On our test bench, each internal amplifier of this particular unit, #...5479, produced peak power of 26+ Volts per channel at 8 ohms for 84+ Watts per channel and 22.5 Volts at 4 ohms for 126 Watts per channel via discrete output transistors (2x 2SA1094 & 2x 2SC2564). DC offset set to no greater than 35 mVDC (unloaded) either channels. AC Idle current at 125 mA. Floor noise >-60dBm. ____________________________ Great performing, Silver Face, Integrated Amplifier, the Kenwood KA-501. Brushed aluminum milled face with all original matching brushed aluminum knobs. It's got a few 'battle scars', such as a missing power switch bat (still usable), some scuffs on the bezel around the power meters, a few scuffs / striations on a knob or two, a few tics along the top edge, and some bumps and bruises to the top, sheet metal covering, but overall, still great looking. Great amp for about any 2-channel, audio system. LOT's of punch and headroom. Check out the 'Slew Rate' and 'Damping Factor' in the specs. Very Impressive! Among the best we have seen in 'consumer' grade audio equipment and way beyond many 'Pro' audio power amps! Big Power very musical sounding amp. Kenwood KA-501 Features include: - Discrete Outputs - Large, power supply for plenty of headroom - Speaker selector for A or B, A+B or Off - Separate Bass and Treble controls, utilizing super quality de-tented pots and are 'de-featable' for purest signal path - 'DC' switch to 'Direct Couple' signal path for purest audio - Oversize Volume control pot utilizing super quality de-tented type - Phono / turntable input with built-in cartridge pre-amp - Dual Tape Monitors with dubbing (may also be used for Video / CD / DVD / LD / VCR / DAT / MP3 / iPod� / iPad� / iPhone� / iPod� / iTouch� / iGadget / eReader / MP3 / XM� / SIRIUS� etc. as well as for CDR) - AUX Input (may also be used for Video / CD / DVD / LD / VCR / DAT / MP3 / iPod� / iPad� / iPhone� / iPod� / iTouch� / iGadget / eReader / MP3 / XM� / SIRIUS� etc.) - Tape Dubbing A->B Capability - Tuner input (may also be used for Video / CD / DVD / LD / VCR / DAT / MP3 / iPod� / iPad� / iPhone� / iPod� / iTouch� / iGadget / eReader / MP3 / XM� / SIRIUS� etc.) - Tape B features DIN as well as standard RCA I/O's - "Loudness" function to boost Bass and Treble in relationship to Mid frequencies at lower volume levels for a much fuller sound. - Built-in Low / Sub-Sonic filter for cutting turntable rumble. - Front mounted 1/4" stereo headphone jack - Binding Post Speaker connectors - Oversize, Rear 'Service Bumpers' - Triple convenience AC outlets; 2 Switched and 1 un-switched for a total capacity of 500 Watts Kenwood KA-501 Original Specs: Design type: 2 Channels, AB operation Rated RMS Output: 70 Watts per channel, min. RMS, at 8 Ohms, both channels driven, from 20Hz to 20kHz. Transient Response: Damping Factor DC-20,000 / 8Ω: 60 Rise Time DC-20,000 / 8Ω: 1.0 μs Slew Rate DC-20,000 / 8Ω: 110 V/μs (All Very Impressive!) Power Bandwidth: 5Hz-40kHz @ 0.03% THD @ 8Ω THD; 0.03% at full rated power (70W) into 8Ω w/ 20-20kHz. Potential Frequency Response: DC Coupled 'On' = 50-300kHz +0dB / -3dB S/N on Phono MM w/ 2.5mV signal: 86dB Input Sensitivity Phono (MM): 2.5mV @ 50kΩ Input Sensitivity Tuner / AUX / Tape: 150 mV @ 50kΩ Phono MM Maximum Input Level: 240mV Phono Frequency Response (RIAA standard Curve � 0.3dB): 20Hz-20kHz Tape Rec Level (Via RCA's): 200 mV @ 120Ω Bass Control; �10dB @ 100Hz Treble Control; �10dB @ 10kHz Subsonic Filter: 18Hz, 12 dB/Oct Loudness Control: +8dB @ 100Hz (-30dB Vol Level) Great unit to provide the basis of a medium to medium large sized Hi-Fi system or 'project home studio'. Again, we have completely gone through it as stated above. With the exception of the above mentioned issues, the unit is in decent cosmetic condition. Unit functions and sounds great! Measures 17.5" wide x 16.25" deep x 6.25" tall and weighs 24 lbs unpacked. Includes our 30 day limited warranty! Cond. 8.5 KENWOOD KA-501 *SOLD 4/23/20* SHIPPED *TO ROBERT IN OHIO* *(Cons. M.H.)* (Above text, in it's entirety, property of www.oaktreevintage.com / Oak Tree Enterprises, LLC. See 'Copyright Information' page for details) archived
*NEW LISTING* *3/16/20* (Click on above thumbnails to enlarge photos) warranty PRE-OWNED FISHER INTEGRATED POWER AMPLIFIER FISHER CA-276 STEREO INTEGRATED AMPLIFIER "210 WPC MONSTER" #...8451 Circa late 1980's MIJ SOLD 3/25/20 SHIPPED TO DARYL IN D.C. � Our technician has completely gone through and 'Certified' this unit. � Following both internal and external visual inspection, the entire unit was cleaned out including all contacts, switches and controls. Switches now clean sounding and performing solidly. Controls are smooth and silent. � Silicone heat sink compound inspected for �suppleness� � Output section bias / DC offset adjusted to factory spec. � Solder joints reflowed on all possible high heat and stress points � All Controls / Switches cleaned where necessary and test for quietness ('Balance' control has remaining issues near it's extreme right and left, but works as intended throughout the majority of it's range.) � All functions tested for perfect operation. � All inputs and functions tested. � Both amplifier sides produce clean and even sine waves! No power supply hum of any kind. It's dead silent! � Following electronic refurbishing, the entire unit was cosmetically detailed. � Great looking with no cosmetic issues and unit looks near NEW. � Following restoration procedures, the unit was ran continuously at medium volume, as all our amplifier / receivers are, into a load with "Loudness" on and both Tone Controls at 10 for 48 hours. On our test bench, each internal amplifier of this particular unit, #...8451, produced peak power of 41Volts @ 8Ω per channel for 210 Watts / channel and 27 Volts @ 4Ω per channel 182 Watts / channel via 8 discrete output devices at 1kHz. (4X 2SC3182 & 4X 2SA1265). AC Idle current at .40A. DC offset adjusted to <20 mV L&R. Floor noise <0.3 mVAC. ____________________________ This Fisher CA-276, Integrated Amplifier was a 'sleeper' when we originally acquired it. We thought it would be too 'recent' to bother with, but then we did our preliminary tests and quickly changed our opinion. It's got a massive power supply transformer, with 'forced air / Wind-Tunnel' cooling via temp controlled electric fan. Once our tech got finished with it, we were thoroughly surprised and impressed. It has a lot of punch and headroom (check our bench test results above against it's original specs) and is VERY MUSICAL sounding. Monstrous internal power supply, relative to most amps in it's range. Not that I place a lot of stock in specs, take a look at them. They're all around impressive. This was a 'Military / PX' / 'Euro / Asia' market unit and was not readily available in North America. While it's got a few 'battle scars' (see photos above), they of course don't affect it's spectacular performance. ____________________________ Fisher CA-276 Features include: - Eight 'Discrete' output transistors for lot's of punch and tone!!!! - 4-Way Built-in Protection - Internal Cooling Fan comes on when internal temperature reaches 85� Celsius - 2-Band, Quasi-Parametric EQ (enables a cool 'Wah-Wah' filter effect by rapidly sliding the 'frequency' control) - Infinitely variable �Turn-Over� frequencies for both Bass and Treble - �EQ Defeat� for purest signal path and most un-adulterated sound - Independent speaker selector switches for A, B, A+B, Off - Phono / Turntable input with Built-In Phono Pre-Amp - �Tape-2� is a 'TRUE' tape monitor (Tape Monitors can be used with Tape decks such as Cassette Tape Recorders/ Players, Reel to Reel's, 8-Track Tape Cartridge Decks, Video / CD / DVD / VCR / DAT / MP3 / iPod� / iPad� / iPhone� / iTouch� / iGadget / MP3 / XM� / SIRUS� CDR (CD recorders as well as for inserting signal processors, such as EQ's, Reverbs, Spatial Enhancers / Dynamic Processors, Noise Reduction units, Special Effects units, Time Delays, etc) - Tape-1 monitor (can be used with Tape decks such as Cassette Tape Recorders/ Players, Reel to Reel's, 8-Track Tape Cartridge Decks, Video / CD / DVD / VCR / DAT / MP3 / iPod� / iPad� / iPhone� / iTouch� / iGadget / MP3 / XM� / SIRUS� CDR {CD recorders} ) BUT since �TAPE-1� is a �Tape Input� and not a �Tape Monitor / Loop� it CANNOT BE USED for inserting signal processors, such as EQ's, Reverbs, Spatial Enhancers / Dynamic Processors, Noise Reduction units, Special Effects units, Time Delays, etc) - Aux / �Video Sound� input (can be used with Tape decks such as Cassette Tape Recorders/ Players, Reel to Reel's, 8-Track Tape Cartridge Decks, Video / CD / DVD / VCR / DAT / MP3 / iPod� / iPad� / iPhone� / iTouch� / iGadget / MP3 / XM� / SIRUS�) - Loudness for enhancing Bass and Treble response at lower volume levels - Stereo / Mono Selector - Dual 12-Segment, Fluorescent Level Meters - Meter Range Selector - Hi filter for reducing tape hiss / electronic hiss & noise and record static - Subsonic Filter to eliminate excess rumble from sources such as turntables - Pre-Out / Power-Amp-In Loop - Front mounted, ��, Stereo headphone jack - Heavy Duty Speaker Binding Posts Original FISHER CA-276 Specifications: AMP SPECIFICATIONS: Power output: 150WPC min RMS @ 8 Ohms & no more than 0.009% THD @ 20-20kHz THD; <0.009% @ full rated power IHF IMD; 0.009% @ full rated power & 8 Ohms Freq Response of power amp section: 20Hz to 20kHz w/ deviation of �0.2dB Damping factor; >20 @ 8Ω / 1kHz Signal to noise ratio: 100dB (line) Input sensitivity - Phono / All Others: 2.5mV (MM) / 150mV (all at 50kΩ) Quasi-Parametric EQ / Tone Control section characteristics: Bass 25-800 Hz w/ �12dB Treble 600-20kHz w/ �12dB Hi-Filter (above 10kHz): -6dB Subsonic / Low-Filter (Below 10Hz): -12dB (this is an INCREDIBLE 'Sub-Filter' both in freq and slope) Loudness Control; +8dB @ 100Hz and +4dB @10kHz Max Power Consumption; 850 Watts PHONO SECTION SPECS; Freq Response; 20Hz-20kHz w/ RIAA deviation of �0.2dB S/N; >75dB Input Sensitivity; 2.5mV @ 50kΩ Phono Overload; 200mV Again, we have done the previously stated refurbishment / restoration work on this unit to insure it's performance, and it gets our full 'Certification'. All functions tested for perfect operation. As we stated earlier, it's got a few 'battle scars' (mostly not visible from the front), but nothing too distracting. Unit Performs and sounds great! We can include an 'e' copy, PDF of the Fisher CA-276 Service manual if the purchaser wishes. Measures 17.25" wide x 6.5" tall x 11.5" deep and weighs an impressive 28 lbs unpacked. Includes our standard 30 day limited warranty. Cond. 8 FISHER CA-276 INTEGRATED AMPLIFIER SOLD 3/25/20 SHIPPED TO DARYL IN D.C. (Above text, in it's entirety, property of www.oaktreevintage.com / Oak Tree Enterprises, LLC. See 'Copyright Information' page for details) (archived)	*NEW LISTING 3/21/19* (Click on above thumbnails to enlarge photos) warranty REFURBISHED / FULLY SERVICED / WARRANTED VINTAGE TECHNICS STEREO INTEGRATED AMPLIFIER TECHNICS SU-7300 / SU7300 #...B051 MIJ Circa 1976-78 SOLD 4/22/20 SHIPPED TO LARRY IN MISSISSIPPI � Our technician has completely gone through and 'Certified' this unit. � Everything was cleaned inside and out including all switches, controls and contacts. Cleaned and re-lubed all control shafts. � Internal fuses checked for correct value / function and replaced where necessary (actually replaced a couple �incorrect� values). � Solder joints reflowed on all possible high heat and stress points � Amplifier section had output bias and DC offset checked to spec levels after 10 min warm-up. � All functions tested for perfect operation. � Following above procedures, unit was cosmetically detailed inside and out. � Power meter illumination lamps replaced with new, fresh bulbs (even though originals were working, old lamps commonly don�t survive SHIPPED) � All inputs tested and both sides produce clean and even sine waves into static 8 & 4 ohm loads! No power supply hum of any kind. It's dead silent! � Following restoration procedures, the unit was run continuously at medium volume, as all our amplifier / receivers are, into a load with "Loudness" on and both Tone Controls at 10 for 48 hours. (Technicians note, "this is a fairly 'tech friendly & serviceable' amplifier design") Total tech time 5+ hours. On our test bench, each internal amplifier of this particular unit, #...B051, produced peak power of 20.5 Volts per channel at 8 ohms for 55+ Watts per channel and 17 Volts at 4 ohms for 76 Watts per channel via discrete output transistors. DC offset set to no greater than 10 mVDC both channels. AC Idle current at 270mA. Floor noise >-60dBm. ____________________________ This Brushed Aluminum Face Technics SU-7300 Stereo Integrated Amplifier looks and sounds great! Great amp for 2-channel stereo systems up to medium-large and "recording studio" use. "Real" output transistors and substantial power supply! Just a great 'all-around utility' amplifier for probably more than 80% of the audio systems out there. Technics SU-7300 Features include: - Real Class A/B amplifier architecture - Large (2.5 inch wide), dual analog VU power meters w/ �Dual� ranges - A or B speaker select - Super quality de-tented volume control - Separate Bass and Treble with high quality de-tented controls - Dual tape deck monitors with 'Tape-2' having a DIN as well as RCA I/O's. (Tape Monitors can be used with Tape decks such as Cassette Tape Recorders/ Players, Reel to Reel's, 8-Track Tape Cartridge Decks, Video / CD / DVD / VCR / DAT / MP3 / iPod� / iPad� / iPhone� / iTouch� / iGadget / MP3 / XM� / SIRIUS� CDR (CD recorders as well as for inserting signal processors, such as EQ's, Reverbs, Spatial Enhancers / Dynamic Processors, Noise Reduction units, Special Effects units, Time Delays, etc) - Bi-Directional Tape Dubbing capability - Phono / Turntable input w/ built-in Phono Pre-Amp - Tuner input (can also be used for ( Video / CD / DVD / VCR / DAT / MP3 / iPod� / iPhone� / iTouch� / iGadget / MP3 / XM� / SIRIUS� etc. inputs) - Loudness function to increase �fullness� of sound at lower volume levels by accentuating the Lower and Upper frequencies relative to the mid range. - Meter range select (x1 or x0.1) - Built-in High filter for reducing 19 kHz FM pilot tones and tape hiss and AM noise - Front mounted �" stereo headphone jack - Back panel features full RCA patch bay for all inputs. Binding post speaker connectors for A&B and Dual AC convenience outlets 1 Switched and 1 un-switched AC outlets for a maximum load of 250 watts of external gear. Technics SU-7300 Specifications: Output: Continuous 41 Watts per channel, min. RMS, at 8 Ohms & 48 Watts per channel, min. RMS, at 4 Ohms, both channels driven, from 20Hz to 20kHz. Design type: 2 Channels, Integrated Pre / Class A/B operation Power Amplifier Damping Factor: >40@ 20-20kHz into 8Ω THD and IMD: 0.08% at full rated power into 8Ω w/ 20-20kHz & 0.04% @ half power Freq Response of Pre-amp: 7Hz-80kHz S/N: 97dB for Tuner, Tape and AUX inputs Bass Control: �12dB @ 50Hz Treble Control: �12dB @ 20kHz High Filter: -6dB / oct @ 8kHz Loudness Control: +8dB @ 100Hz (-30dB Vol Level) Input Sensitivities: Non-Phono inputs = 150mV / 47kΩ Tape outputs: 150mV PHONO SECTION SPECS: Freq Response: RIAA standard w/ RIAA Equalization of �0.3dB S/N: >78Db Residual hum and noise: 0.6mV Input Sensitivity: 2.5mV @ 47kΩ Phono Overload: 150mV Again as stated earlier, the Amp has had our standard FULL SERVICE inside and out including cleaning all control pots and contacts, replacing any necessary parts, and completely tested. All functions have been tested and pass with flying colors! New meter lamps installed for trouble-free service. Face and knobs are in excellent condition. Unit looks and sounds great! Measures 17�" wide x 14" deep x 5�" tall and weighs 20 lbs unpacked. Includes our 90-day limited warranty! TECHNICS SU-7300 Cond. 8.5 SOLD 4/22/20 SHIPPED TO LARRY IN MISSISSIPPI *(Cons. M.H.)* (Above text, in it's entirety, property of www.oaktreevintage.com / Oak Tree Enterprises, LLC. See 'Copyright Information' page for details) archived				NEW ADDITION *8/20/19* (Click on above thumbnails to enlarge photos) warranty FULLY SERVICED WITH WARRANTY VINTAGE TUBE CLASSIC! DYNACO / DYNAKIT PRE-AMP / CONTROL AMPLIFIER DYNAKIT PAS-2 #...6855 Circa 1964-69 FACTORY BUILT VERSION MADE IN AMERICA SOLD 8/13/2020 SHIPPED TO DARRELL IN OREGON � Two technicians have completely gone through this unit. First an 'old-school, outside' shop, versed in tubes prior to it reaching us, then by our senior tech. The procedures outlined below will be spread between the two shops. � We have completely gone through this unit, cleaning inside and out including all contacts, switches and controls. � Power transformer replaced � All existing tubes tested fine (4x German Dynaco / Telefunken 12AX7 & 1x USA Tungsol 6X4 Rectifier tube) � New Electrolytic Filter capacitors � Selenium rectifier replaced with Silicone Diodes at some point in it's past (always preferable) � 12X4 replaced with 6X4 at some point in it's past (common mod) � Other various resistors and capacitors replace per previous service work � New #1893 Pilot lamp installed which taller than original, thus increasing brightness of Orange jewell � Unit All RCA I/O jack terminal solder joints re-flowed internally � Unit cosmetically detailed, but does have a few scratches on the metal case /cover and various 'marks / stains' to the brass face panel (see photos above) � All functions tested for perfect operation. � All inputs tested fine following I/O re-flow operation � Both sides produce clean and even sine waves! � No power supply hum of any kind. It's dead silent! ____________________________ Classic, Tube Pre-Amp. These have been a 'Vintage Hi-Fi Mainstay' for decades. Great pre to build a system around. GREAT sounding as well. Not a fan of the I/O jack labeling (or lack there-of), but that was an earlier time. DYNAKIT PAS-2 Features include: - 5-Tube circuitry - Partial Point to Point wiring design - Separate L&R Bass and Treble Controls - Stereo / Mono / BLEND control - Tape monitors with A>B dubbing (may also be used for Video / CD / DVD / LD / VCR / DAT / MP3 / iPod� / iPad� / iPhone� / iPod� / iTouch� / iGadget / eReader / MP3 / XM� / SIRIUS� etc.) - Spare (AUX / CD) (may also be used for Video / CD / DVD / LD / VCR / DAT / MP3 / iPod� / iPad� / iPhone� / iPod� / iTouch� / iGadget / eReader / MP3 / XM� / SIRIUS� etc.) - Separate AM or FM Mono or FM Stereo inputs (may also be used for Video / CD / DVD / LD / VCR / DAT / MP3 / iPod� / iPad� / iPhone� / iPod� / iTouch� / iGadget / eReader / MP3 / XM� / SIRIUS� etc.) - Phono / Turntable input with Built-In Phono Pre-Amp - Tape Head Input. This is used for connecting a 'transport only' type, Reel to Reel tape deck - "Special" input. This is currently somewhere between 'Tape-Head' and 'Phono' level. It is an input that can be internally wired for a number of input configurations, including a second turntable, magnetic or crystal cartridges, microphones or specifically for 78 RPM records or...etc. - 'Scratch' / Hi-Filter for reducing 'hiss' in AM etc. - Loudness selector - 4 AC outlets, All un-switched Dynakit PAS-2 Original Specs: *Design type:* 2 Channels, Analog operation Transient Performance; "Pass square waves without ringing and with minimum deformation from 20-20kHz. No 'over-shoot or bounce on 'pulse type' signals. Instantaneous recovery from overload (means great damping factor and fast slew rate) THD Tuner, AUX and Tape, 20-20,000Hz: 0.05% @ 1V output Hum & Noise: "2 microvolt equivalent noise on RIAA. 74dB below level of 10 mV signal." Bass Control; �20dB @ 20Hz Treble Control; �14dB @ 20kHz This is one of the most famous of the vintage pre-amps. All Tube design, and surprisingly 'quiet'. Rear I/O label faded, so we're including a 'printed sheet' with the I/O labels. Unit looks good, works and sounds great! Measures 13" wide x 4.25" tall x 8.5" deep and weighs 8 lbs unpacked. Includes 30 day limited warranty, not applicable to tubes. FACTORY BUILT, DYNAKIT PAS-2 Cond. 8 SOLD 8/13/2020 SHIPPED TO DARRELL IN OREGON with originally installed, Four German made, Dynaco / Telefunken 12AX7 tubes!!! (as well as the USA 'Tungsol') (CONS. R.R.) (Above text, in it's entirety, property of www.oaktreevintage.com / Oak Tree Enterprises, LLC. See 'Copyright Information' page for details)
					*NEW* *LISTING 11/2018* (Click on above thumbnails to enlarge photos) warranty SERVICED / BENCH TESTED NHT (NOW HEAR THIS) MONAURAL SUB-WOOFER POWER AMPLIFIER NHT SA-3 #...1346 "WORLD AC POWER" � Circa 1998 for sale Our technician has completely gone through and 'Certified' this unit cleaning contacts, controls and pots. � Amp has been cleaned inside and out. � All inputs tested and both side produces clean and even sine waves! � All functions have been tested and pass with flying colors! � This amplifier is in both great electronic and physical shape. � No power supply hum of any kind. It's dead silent! � Following restoration procedures, we burned it in, in the shop at continuous high volume for 8 hours straight and it functioned flawlessly. Looks great and sounds fantastic! On our test bench, this unit's amplifiers produced 37 Volts at 8 Ohms per channel for 170+ Watts / channel and 35 Volts at 4 Ohms per channel for 305+ Watts / channel via discrete output transistors. (DC offset measured at outputs at 1.1mVDC. Idle AC current draw @ .34A.) Great "Subwoofer" power amp for a variety of consumer and Pro-Audio applications. Super quiet operation and build quality. Class-G architecture, which is great for 'lower frequencies' to get lots of power efficiently. Externally located (gets the heat outside of the cabinet where it belongs), vertically finned heat sink for very efficient and silent, passive cooling of output devices (all amps / receivers should be designed this way). NHT SA-3 FEATURES: - Class-G (great for 'subwoofer' applications) - Built-in Frequency limiter / selectors Hi-Pass filter selectable 65Hz, 80Hz, 100Hz, 125Hz and 150Hz (rear panel) Low Pass Filter continuously variable from 32Hz to 150Hz (rear panel) - Phase selectable for 0�, 90�, 180�, & 210� (rear panel) - Variable Input Level control (front panel) - Vertically mounted, external heat sinks - Gold Plated RCA signal I/O's - While we did test this stable to 4 Ohms, it is likely rated for a min of 6 Ohms as that what it's 'spec' rating is (no minimum rating stated on rear panel) - Speaker outputs via 3-Way binding / banana posts - Discrete output transistors - True "WORLD AC POWER"� allows unit to be operated on 50 or 60 Hz AC and will select voltages from 110v, 120v, 220v and 240 Volts AC input. NHT SA-3 ORIGINAL SPECIFICATIONS / SPECS: System Type: Monaural Class-G Subwoofer Amplifier Continuous Average Output Power: 250 Watts @ 6 Ohms THD: 0.03% @ full rated output On our test bench, the amp produce perfectly clean and symmetrical sine waves at both 8 & 4 Ohm loads. Includes an 'e-copy' pdf download of the NHT SA-2 Owners / users manual. Measures 17" wide x 14.5 deep x 5.2" tall and weighs 24 lbs unpacked. Includes our standard 30 day limited warranty. NHT SA-3 Cond. 8.5 ON HOLD FOR SHOP / OWNERS USE 12/21/18 Here's a link to an original review of it... (Above text, in it's entirety, property of www.oaktreevintage.com / Oak Tree Enterprises, LLC. See 'Copyright Information' page for details)


** "(actual as measured)" refers to original test results done by Hirsch-Houck Laboratories upon test release of product when new. Current "aged" specifications / performance may of course vary from that.

FULLY SERVICED / WARRANTED STEREO PRE-AMPS, POWER AMPS, INTEGRATED AMPLIFIERS USED, VINTAGE & CLASSICS FOR SALE

FULLY SERVICED / WARRANTED
STEREO PRE-AMPS, POWER AMPS,
INTEGRATED AMPLIFIERS
USED, VINTAGE & CLASSICS FOR SALE