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Information wanted on an old amp
Information wanted on an old amp
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Old 29th July 2015, 01:59 PM   #1
jerr2016 is offline jerr2016
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Default Information wanted on an old amp

Hi there. Noob here .

I joined to see if anyone had any information about this amp, and if it has potential.

I'm used to seeing an power transformer in the middle, like on a ST-70.In fact, the transformers look exactly like the output trannies on a Dynaco St-70 IIRC

I think this is out of a old tube console stereo, am I right? .

Could anything be done with this, besides a boat anchor?

Thanks

Click the image to open in full size. Click the image to open in full size.[/IMG]

Last edited by jerr2016; 29th July 2015 at 02:15 PM.
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Old 29th July 2015, 03:02 PM   #2
DF96 is online now DF96  England
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Are you sure it is stereo? I can see what looks like a mains transformer and an output transformer. I would guess push-pull mono.

A good photo of the underside (and front/back panels) might help someone identify it.
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Old 29th July 2015, 03:10 PM   #3
jerr2016 is offline jerr2016
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Quote:
Originally Posted by DF96 View Post
Are you sure it is stereo? I can see what looks like a mains transformer and an output transformer. I would guess push-pull mono.

A good photo of the underside (and front/back panels) might help someone identify it.
Yes, thanks again. You are probably right. Might make a better guitar amp? IDK.

I'll try and get a gut-shot later.
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Old 29th July 2015, 06:34 PM   #4
sreten is offline sreten  United Kingdom
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Hi,

I'd say its push pull mono. Two output valves, two gain valves
and valve rectifier on the right. Single phono input on the front.

A shot of the rear connections would confirm.

rgds, sreten.
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Old 29th July 2015, 07:30 PM   #5
Eli Duttman is offline Eli Duttman  United States
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Quote:
Originally Posted by sreten View Post
Hi,

I'd say its push pull mono. Two output valves, two gain valves
and valve rectifier on the right. Single phono input on the front.

A shot of the rear connections would confirm.

rgds, sreten.
Agreed!

The Noval sockets seem to be phenolic wafer. That suggest some "bean counting" went on, as is typical in console setups.

Is there any indication of the OEM tube complement? The "iron" looks substantial. Perhaps a 5U4 rectifier and 6L6 "finals".
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Old 29th July 2015, 07:35 PM   #6
kstagger is offline kstagger  United States
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If that is Dyna iron - then maybe it's a homebrew version of a Hafler/Keroes circuit. Maybe a Mullard 5-20 or Williamson.

There are a number of homebrew monoblocks out there from the era, some that are even really well-built. Sadly most are just that - monoblocks - so getting two for stereo listening is impossible unless you build the second yourself - a real hassle to source the chassis and iron to match.
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Old 29th July 2015, 08:36 PM   #7
Eli Duttman is offline Eli Duttman  United States
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A thought, once the "iron" is identified, is to use the power trafo for a SE stereoblock and sell the PP O/P "iron" off.

As the sockets are riveted, I'm inclined to think the unit is factory, not DIY, built.

A Mullard circuit makes considerable sense. All Octal sockets are to be expected in a Williamson, but there's the Heath W5M.
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Old 29th July 2015, 09:33 PM   #8
Zibi is offline Zibi  Poland
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AX84.com - The Cooperative Tube Guitar Amp Project
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Old 29th July 2015, 09:36 PM   #9
Jsixis is offline Jsixis  United States
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reminds me of a Conn organ amplifier
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Old 29th July 2015, 10:21 PM   #10
trobbins is offline trobbins  Australia
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Yes, very organish given the huge size of the OT. Some care with preamp screening, and output socket alignments, and coupling cap outer foils, but lots of opportunities for improvement and would make a great guitar amp.

It may need an extra heater transformer?
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