TUBE AUDIO AMPLIFIER / VINTAGE AMP CHASSIS
AS-IS / U-RESTORE UNITS
VINTAGE AND CLASSIC

 

PHOTOS COMING

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NEW LISTING
VINTAGE BERKELEY SCIENTIFIC
TUBE AMPLIFIER
POWER TRANSFORMER
MODEL 6-2151 / 5493
Circa 1954
for sale
Primary voltage 117 VAC
Secondaries:
425V-0-425 V
117V
6.3V @ 3.0A
5.0V @ 3.0A
6.3V # 12.0A
Silkscreening states "Manufactured by Osborne Electric Company, Portland, Oregon.
Very little wear to finish. Silk-screening in great shape. All 4 mounting bolts nice and straight and not 'cross-threaded'. Bake-lite terminal housing intact with no cracks or chips. All terminals intact and tight. Bench tested for correct voltage.
$145.00

 

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NEW LISTING 3/1/20
VINTAGE ALTEC 342B 4 CHANNEL TUBE PA HEAD / AMPLIFIER
WITH PEERLESS TRANSFORMERS!
ALL AMERICAN TUBES!
for sale
SOLD 7/19/2021
SHIPPED TO GREG IN LOS ANGELES, CALIFORNIA
Altec 342B Tube Amplifier in 'as-found', but 80%+ tested.
We tested all the tubes on our BK 747B and recorded the results on each tube. They all had great numbers, with plenty of 'Life Span' showing on the meter. All the tubes are American and either GE or RCA. Dual RCA 7027 output tubes (one of the "7027" tubes has it's bakelite 'guide / locating key' broken off, but has been marked for orientation), 3x 12AX7 Pre-Amp tubes and the tube rectifier is 5U4. All the Peerless 4722 microphone transformers (yes, the one's that everyone wants for their 'Cartridge Head Amps') test even in impedance as well as the Peerless "Line Transformer", model 15095. All inputs tested and all the channels had clean pots (we still cleaned them as well). We slammed it into a 'brick wall', 8 Ohm load w/ 1k and got 17+ Volts (36 Watts) with clean pos and neg Sine waves that were even and symmetrical all the way to the rails till clip. Amp sounded great through a single 12" PM load, and each channel was checked with a microphone.
Cosmetically, overall the amp is in great shape. There's an area on one end of the green, Tolex cab where someone had something mounted at one time (required 3 or 4 small drilled holes). There's some surface rust on the transformers and some typical 50+ year old,  'splotches' of corrosion / staining on the zinc coated chassis.
This amp chassis could be 'circuit bent' into many forms and uses, as well as of course, utilized the way it is. If you're reading this, I assume you are aware of what it's parts alone are worth. We're selling it with some 'meat left on the bone' if you wanted to further restore it for re-sale, or 'part it out' as we didn't put a lot of time into it, and don't plan on it.
As-Is, but working well currently
$750.
SOLD 7/19/2021
SHIPPED TO GREG IN LOS ANGELES, CALIFORNIA
(R.R. Cons.)


 

UNKNOWN 2x 7591 MONO-BLOCK
SOLD 1/5/2025

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VINTAGE
WURLITZER
MODEL 7039
MONO-BLOCK
TUBE AMP / AMPLIFIER / CHASSIS
Circa likely 1950's
for sale
Wurlitzer, Model 7039, Mono-Block tube amplifier. The chassis only has a Primary transformer, and no output transformer? Transformer part number is 114334 / 412922. The 8 tube sockets are as follows; 1x 5U4GB, 2x 7027, 2x 12AU7, 1x 12AX7 and 1x 7025. No tubes are included. We have tested the 3 filter caps with our EDS 88A cap analyzer.
Cap values are as follows:

#1 - 20mfd / 400 VDC,
20mfd / 400 VDC
& 25mfd / 25 VDC.

#2 - 30mfd / 500 VDC,
20mfd / 400 VDC,
20mfd / 400 VDC,
25mfd / 50 VDC.

#3 - 50mfd / 500 VDC,
40mfd / 500 VDC,
20mfd / 400 VDC,
25mfd / 50 VDC

All caps tested fine. No further testing has been done at this point. Amp is in good cosmetic shape as well. Any tubes shown in the photos are not included. Chassis measures 12" x 10" x 7.5".
SOLD 1/5/2025

 

WARNING: Older designed tube audio equipment can be VERY dangerous. Typically the undersides are completely exposed. Operating voltages are commonly 300 to 900 Volts! (most modern, solid state audio gear operates on internal voltages of 9-50 Volts,  and commonly 12v)  Internal capacitors can carry lethal charges for years after they have been disconnected from their AC power source. Even carrying a tube unit can be deadly if your fingers curl around the bottom and touch the wrong area. At the least you can get a shock that would likely cause you to drop the unit immediately. Believe me, I've done it. In addition, the tubes are often exposed, and get very hot when operating. Commonly hot enough to melt rubber / plastic wire insulation and certainly hot enough to burn skin. These units generally have no safety / protection circuits built in, with the exception of maybe a simple line fuse. If anything "goes south" on them or in the system they are being used in, they will likely continue to run. This can cause further damage to the unit itself, other components or fire.
 Much of this equipment has been tested only to a limited degree. The test results posted or listing text should in no way be construed as an indicator of the performance you will experience or as evidence that the unit is ready to use or that it should even be operated under any conditions. Thus they are being offered for sale as collectors items, and as curiosities only for display. The AC cords will commonly be severed prior to posting (except on highly collectible units where greater degrees of originality are valued).
 They don't make 'em like this anymore for a reason. Anyone who plans on actually trying to use one of these or any "vintage" tube unit should have it first checked / modified to a level of safety they are comfortable with by a qualified technician.

WARNING: PLEASE USE CAUTION WITH ANY ELECTRICAL ANTIQUE. MOST OF THESE THINGS WERE DESIGNED AND MANUFACTURED WITH MUCH LESS CONSUMER PROTECTION BUILT- IN. THEY MAY ALSO HAVE BECOME MORE DANGEROUS WITH TIME. ANY REPAIR OR RESTORATION SHOULD BE UNDERTAKEN ONLY BY A QUALIFIED TECHNICIAN.


 

 

It's all a matter of taste: Some old 'tube audio chassis' can be repurposed / re-designed as 'Steampunk' projects.

 

 Many of their parts such as tubes, knobs, dials, chassis, transformers etc are from the "Machine Age" with a very 'Industrial' look to them. We may even use a few for some 'Steam Punk' projects around here.

 

 

Jerry Gahagan of OakTreeVintage
Taken in portion of Speaker Audition Room
Vintage Home Audio Speakers from the late 1960's into the 1980's

NEW LISTING
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VINTAGE
HAMMOND
MODEL M-3 M3
Chassis #AO-29-1F
MONO-BLOCK
TUBE AMP / AMPLIFIER / CHASSIS 
SOLD 7/23/07
Circa likely 1950's
for sale
Hammond, Model M-3 / AO-29-1F, Mono-Block tube amplifier. We have only connected it to AC with known good tubes installed. It drew .4 Amps. At this point the amp is untested further than that, simply due to lack of exact connection knowledge. If anyone wants to offer assistance on correct connection to test further, it would be welcome. Primary Transformer part number is H-AO-22111-1. Other chokes / transformers marked AO-20936-3. The 11 tube sockets are as follows; 1x 5U4, 1x 6BA6, 2x 6V6, 1x 12AX7, 2x 12AU7, 2x 6AU6 and 2x 6C4. No tubes are included. We have tested the 3 filter caps with our EDS 88A cap analyzer. Cap values are as follows:

#1 - 50mfd / 450 VDC

#2 - 40mfd / 400 VDC,
20mfd / 400 VDC,
20mfd / 300 VDC,
30mfd / 25 VDC.

All caps tested fine. No further testing has been done at this point. Amp is in good cosmetic shape as well. The tubes shown in the photos are not included. Chassis measures 22" x 6" x 6".
$125.*
SOLD 7/23/07
 

 

   


 
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VINTAGE
UNKNOWN
DUAL 6L6?
MONO-BLOCK
TUBE AMP / AMPLIFIER / CHASSIS
Circa likely 1950's
SOLD 2/21/13
SHIPPING TO CALIFORNIA
Unknown Mono-Block tube amplifier. It came to us without any tubes installed or tube indications marked on the chassis. After a bit of research and info from a customer, we installed 1x 5U4GB, 2x 12AX7 and 2x 6L6GC's. No tubes are included. The amp worked great! Current draw with tubes was .85A at idle. Transformer part numbers are; Primary - TR-126-A & Output - TR-125. No tubes are included. We have tested the 4 element filter cap with our EDS 88A cap analyzer. Cap values are as follows: #1 - 40mfd / 450 VDC,
20mfd / 450 VDC,
20mfd / 450 VDC,
20mfd / 450 VDC,
(All lugs in use.)

On our test bench:
The amp produced 10.6 Volts just prior to clip at 8 Ohms for 14 Watts. We did not test it at 4 or 16 Ohms. It draws .85A at idle. Produced perfectly clean sine waves to clip.

Amp is in good cosmetic shape as well. Any tubes shown in the photos are not included. Chassis measures 10" x 9.5" x 5.25".
$150.*
SOLD 2/21/13
SHIPPING TO CALIFORNIA
 

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VINTAGE
DYNAKIT MK IV
TUBE AMP CAGE / COVER
Circa 1961
for sale
Great condition Dynakit / Dynaco Mark IV tube amplifier cage / cover. Original finish in great condition. No dents, bends or broken welds. Logo intact and excellent. No screws included.
$45.
SOLD 9/7/07


 

       
 
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VINTAGE
DYNAKIT MK IV
MONO-BLOCK
TUBE AMP / AMPLIFIER
Circa 1961
for sale
Great condition Dynakit / Dynaco Mark IV tube amplifier. Original brown / bronze finish on cage in great condition. Some typical light surface corrosion to the nickel plating on the chassis. With the exception of the original Dynaco 7199 tube (needs to be replaced as it's weak) no tubes are included. We have tested the filter caps with our EDS 88A cap analyzer. All test fine. We installed our tested "shop tubes" along with the existing 7199 for the bench test. The transformer pretests with 7.4v, 410-0-410v, & 59 VAC (all voltages ground referenced to chassis). The tube sockets are for 1x 7199, 1x 5AR4 and 2x EL34/ 6CA7.

On our test bench:
The amp produced 19.93 Volts just prior to clip at 8 Ohms for 49.65 Watts (originally rated at 40 Watts). It draws .9A at idle. Produced perfectly clean sine waves to clip.

Original Specs:
Freq Response: +-5db / 10-40,000Hz
IM Distortion: <1% at full rated power / 40 Watts
S/N ratio: 90db below 40 Watts
Outputs rated @ 4, 8 or 16 Ohms

Amp is in great cosmetic shape as well. Sounds great! Comes with original bottom plate and cage with logo.
SOLD 9/23/06
 

 

    


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VINTAGE
FISHER
30-A 30A
MONO-BLOCK
TUBE AMP / AMPLIFIER
Circa 1959
for sale
Great condition Fisher 30-A, Mono-Block tube amplifier. Original finish in great condition. We have tested the filter caps with our EDS 88A cap analyzer. All test fine. We installed tested tubes from our stock for the bench test and they are included (no Chinese tubes). Will be old Russian and USA tubes. The tubes are 1x 6CA4 / EZ81, 1x 12AX7 / 7025 / ECC83 and 2x EL84/ 6BQ5 / 7189.

On our test bench:
The amp produced 10.75 Volts just prior to clip at 8 Ohms for 14.5 Watts. At 4 Ohms 8v / 16 Watts & @ 16 Ohms it produced 15.5 v / 15 Watts. It draws .85A at idle. Produced perfectly clean sine waves to clip. We did not test above clip.

Original specs:
Freq Response: 20-20kHz
THD <1% @ 20 Watts
Hum & Noise Completely Inaudible
Peak Power 38 Watts
Output 4, 8 & 16 Ohms

Transformers are originals. Amp is in great cosmetic shape as well. Quiet and sounds great! The tubes shown in the photos are included.
SOLD
 

    


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VINTAGE
RCA / CUSTOM MODIFIED
CLASS-A, STEREO
Quad EL84 / 6BQ5
TUBE AMP / AMPLIFIER / CHASSIS
Serial #63186
SOLD 12/6/07
Circa likely 1960's
for sale
RCA / custom modified  Stereo tube amplifier chassis. It came to us without any tubes installed or tube indications marked on the chassis. We deduced the likely suspects and installed 1x 5U4GB, 3x 12AX7 and 4x EL84 / 6BQ5's. No tubes are included. The amp worked great! Current draw without tubes was .2A and with tubes, 1.3A at idle. The current draw remained the same all the way through to clip (stands to reason since it's a Class-A amp) Transformer voltages are as follows: 390v-0-390v, 6v, 3.7v-0-3.7v, 1.5v, .5v & 12.6 VAC (all voltages ground referenced to chassis). Transformer part numbers are; Primary - 972114-14 / 1386315 & Outputs - RCA 971165-14 / 1386248 & RCA 971165-15 / 1386308. We have tested both filter cap with our EDS 88A cap analyzer. Cap values are as follows: #1 - 
80mfd / 400 VDC,
80mfd / 400 VDC

#2 - 35mfd / 400 VDC,
35mfd / 400 VDC,
20mfd / 25 VDC,
20mfd / 25 VDC

On our test bench:
The amp produced 9.5 Volts just prior to clip at 8 Ohms for 11.28 Watts. We did not test it at 4 or 16 Ohms. It draws 1.3A at idle and all the way through to clip. Produced perfectly clean sine waves to clip.

RCA inputs. Amp is in good cosmetic shape as well. Only issue is that one of the filter caps has a broken mounting flange, so it "lists" to one side a bit. Should be replaced. Any tubes shown in the photos are not included. Chassis measures 14.5" x 8" x 6.25".
$225.*
SOLD 12/6/07
PS. We had a visitor tell us that he has the same amp and that his sounds great! Thanks for the info Keith.

 

MCINTOSH
MC-40
COND. 9.0
SOLD

VINTAGE RAULAND TUBE AMPLIFIER
RAULAND MODEL 1805A
#39153
CIRCA 1953-54
NOS (NEW OLD STOCK)
UNUSED IN ORIG BOX.
UNUSED IN ORIG BOX. STILL HAD

Cardboard surrounds on transformers. Was vari-AC'd over 30 minutes, in 10 Volt increments, and finally left to run for a half hour into an 8 Ohm load. Rated at 20 Watts, from 2 metal 6L6 output tubes. Had small amount of audible  60 cycle hum  when turned up past half way. Faithfully reproduced a number of different test tones both audibly and on a scope. Has control pods mounted on the ends of fixed cables. No scratches, dents, rust, corrosion, finish chips, etc. This thing shines. 
 Cond. 10.0
SOLD

 

EICO
HF-20
                   SOLD                  

 

LEAK
TL / 12 PLUS AMP
&
"POINT-ONE PLUS" PRE-AMP
CIRCA '58
SOLD
 

   

  

NEW ADDITION 4/19/06
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EICO HF-60 HF60 TUBE MONO POWER AMP AMPLIFIER
SOLD 5/1/06
Excellent Shape Cosmetically, needs work??
I have had this for a few years and just got around to trying it out. It is beautiful cosmetically, but it had a past issue with the a filter cap blowing. Someone had put a cap underneath the amp, but I don't think it's wired right and I don't have a schematic or service manual, so am limited as to my repair abilities. I do not know the condition of the transformers. No rust or corrosion anywhere, except residue from the blown cap. The tubes are sockets are 2x 3L34, 1x 6SN7GTB, 1x EF86 and 1x 5AR4. No tubes are included with the amp.
Selling As-Is for restoration.
Cosmetic Cond. 8.5
$650.
SOLD 5/1/06
 

 

   

NEW ADDITION 4/19/06
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MCINTOSH
MA230 MA-230
SOLD 4/20/06
TUBE INTEGRATED AMP AMPLIFIER
Excellent Shape Cosmetically, needs something??
I have had this for a few years and just got around to trying it out. It is beautiful cosmetically, but I can only get very low output from it. I tried different tubes (tested), but I don't think the problem is in the output section. I'm not even sure it is in the solid state preamp section (this unit is a hybrid in that the preamp is Transistor and the power amp is tube, but I assume you already knew that). I can't seem to get a signal much past the input selector switch. Since it is happening to both channels there is likely a single ground somewhere that is not getting a good connection. The tubes are all getting plenty of power and are heating up. I don't have a schematic or service manual, and this seems to be a fairly sophisticated amp, so am limited as to my repair abilities. If anyone has any ideas different than what I have covered I would love to hear them. Might keep it if I could get it going. Again, cosmetically it's "LIKE NEW". No rust or corrosion anywhere and the chrome and glass are perfect. All original knobs intact. The tubes are 4x 7591, 2x 12AU7 and one 12AX7. They are a mix and all USA! If you get the amp going you should probably plan to put in a set of matched output tubes, but the preamp tubes would be fine.
Selling As-Is
Cosmetic Cond. 9+++
$750
SOLD 4/20/06