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Old 6th March 2011, 02:18 AM   #1
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Default peavey tube amplifiers

Hello,
I have two Peavey tube amps, rated @ 120 watts each, one has soild state pre amp, the other four 12ax7 tubes. Each amp has four 6L6GT output tubes. Both are operational. I would like to build a stereo audio amplifier from the available parts. Can anyone recommend a schematic or design which will use these components.

Regards, Richard
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Old 6th March 2011, 02:22 AM   #2
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Sinse they are both 120 watt, four 6L6 tubed, why not use one for the left, and one for the right? There's your stereo.
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Old 6th March 2011, 02:49 PM   #3
DF96 is offline DF96  England
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It is generally found that the two channels of a stereo system have to use similar amplifiers. A solid-state driver and valve driver are unlikely to be sufficiently similar, even given identical output stages. You would get sound from both speakers, but that is not quite the same as stereo. Also, Peavey are PA/guitar amps? - so designed to be part of an instrument, not faithfully reproduce existing sound. You might not even be able to reuse the output transformers.
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Old 6th March 2011, 04:36 PM   #4
kevinkr is offline kevinkr  United States
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I'd sell these on and use the money to build a proper stereo amplifier. DF96's point about the OPTs is particularly relevant since Peavey is known to scrimp a bit on the quality of key components in order to help keep the cost down.

What kind of speakers would the proposed amplifier be used with, and how much power do you think you actually need?

Perhaps Pete Milletts recent amplifier design with a set of Hammond or better still Electra-Print OPTs would fit the bill?

Posted new P-P power amp design
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Old 6th March 2011, 05:31 PM   #5
M Gregg is offline M Gregg  United Kingdom
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I agree with DF96 & KevinKr,

The Peavey is not the way to go! The components in these amps are great for Guitar, however not for HIFI! If I say that a Les Paul sounds great with disc ceramic caps on the tone controls-these sound awfull on HIFI. (Microphonic etc). So what sounds good for instruments may be opposite for HIFI.

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Old 6th March 2011, 05:32 PM   #6
jjman is offline jjman  United States
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Used Peavey's don't command high prices so selling them may not finance much of the project. I can see going forward on a project like this especially if it's a 1st audio build. I've built guitar amps but not an audio amp. If I had those amps laying around I'd be looking to do the same thing. Those OPTs can’t be too wimpy but frequency range should be considered of course. Hopefully they are both the same model/specs.

My 1st guitar amp build was very low budget using leftover wood and the chassis from a $2 flee market computer power supply chassis. I had no idea if it would ever work or even explode on me. No good websites around at that time. Came in around $2-300 total cost and still has the best tone of all of mine, even if it looks funny.

Last edited by jjman; 6th March 2011 at 05:45 PM.
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Old 6th March 2011, 05:37 PM   #7
M Gregg is offline M Gregg  United Kingdom
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I can see what JJman is saying.

If you just want a tube amp then I suppose you could rip parts out. It just depends on what level you are aiming for! You have two O/P Tx's and power Tx,s plus tubes. You could make a fun project! Wonder what a Baby Huey would sound like it's supposed to be good with not so wonderful O/P Tx's

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Old 6th March 2011, 11:24 PM   #8
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The problem is with the output transformers. They are not full range in hifi terms. Power transformer might be a bit high, guitar amps like to push the tubes, but it is easy enough to drop some voltage. You probably have enough signal tubes in the one amplifier since guitar amps need more gain than hifi. Running the output transformers at a lower power range may give you more of a low end and some negative feedback could make up for some lows and highs.

The easiest thing to do is take the one all tube amp and use only one 12AX7 stage as gain (maybe change it to a lower gain tube) into the PI and just tweak the circuit till you get something that works.
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Old 7th March 2011, 04:26 AM   #9
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OK, some clarification here! Peavey PA/guitar amps are not good for hi-fi stereo, but was only suggesting using both instead of tearing them apart. I think the only user serviceable parts for any stereo build are the 6L6 and 12AX7 tubes. Everything else needs to be of hi-fi quality if that is your intended goal.

Unless you have golden ears, solid state & tube preamps (front ends) are not that different in total output sound if the outputs are all tube. Sure, they may sound a little different, but not totally useless in that they will not make the sound un-bearable.
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Old 7th March 2011, 04:31 AM   #10
korey is offline korey  United States
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Quote:
Originally Posted by DF96 View Post
It is generally found that the two channels of a stereo system have to use similar amplifiers. A solid-state driver and valve driver are unlikely to be sufficiently similar, even given identical output stages.
Wrong! There's not that much difference in total output. Tube output still gives that tube sound whether its a solid state or tube preamp front end.

Last edited by korey; 7th March 2011 at 04:35 AM.
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