Noisy Peavey Deuce

[Daddles]

Hi
I have an old Peavey Deuce amp which I've owned for about 25 years. It's recently started making a noise which I can only compare to the sound of someone blowing into a microphone at close range (sorry it's the nearest thing I could come up with).
The noise is continuous but varies in intensity and amplitude and sometimes builds up into a crescendo and then suddenly cuts out.
I've changed all tubes (matched quads) but this made no difference.
Does this ring any bells with anyone?

Cheers

Daddles.

[Enzo]

Plain old Deuce or Deuce VT? If Deuce, look on serial # plate, B-series maybe?

SO if it isn;t the power tubes, then you have a noise in your preamp.

Isolate the problem. Which controls if any have ANY effect on the noise? Can you turn the noise volume up and down? Can you alter the tone of the noise? Does the noise care which channel is on? Or any effect? Controls that affect the nooise are after its source.

[überfuzz]

Hard to nail it by just reading your post. If your going to tinker with it: when was the filtercaps changed? Might be something else too but a wild guess is that they've beeen sittning there for 25 years.

[Daddles]

Hard to nail it by just reading your post. If your going to tinker with it: when was the filtercaps changed? Might be something else too but a wild guess is that they've beeen sittning there for 25 years.

Thanks for your responses, will do the checks suggested tomorrow (working today).

Will try changing the filter caps, they will more than likely be the original ones.

Cheers guys.

[soundguruman]

Hi
I have an old Peavey Deuce amp which I've owned for about 25 years. It's recently started making a noise which I can only compare to the sound of someone blowing into a microphone at close range (sorry it's the nearest thing I could come up with).
The noise is continuous but varies in intensity and amplitude and sometimes builds up into a crescendo and then suddenly cuts out.
I've changed all tubes (matched quads) but this made no difference.
Does this ring any bells with anyone?

Cheers

Daddles.

Yes it does ring a bell, the output tube board tends to arc and burn.
In order to inspect this board you have to drill out the rivets.
Yes the board is installed with rivets, not screws. And then to reinstall, you have to rivet it back in...
or design your own hardware to re-mount the board.
Another suspect is the driver transistors. (video driver transistors actually)
the transistors tend to fail.

[überfuzz]

Yes it does ring a bell, the output tube board tends to arc and burn.
In order to inspect this board you have to drill out the rivets.
Yes the board is installed with rivets, not screws. And then to reinstall, you have to rivet it back in...
or design your own hardware to re-mount the board.
Another suspect is the driver transistors. (video driver transistors actually)
the transistors tend to fail.

Wow, now the bells ringning! After I read gurumans post I remember. I actually fixed a power section in an deuce. Guruman is spot on, exactly what I saw in the gutted amp.

[soundguruman]

Wow, now the bells ringning! After I read gurumans post I remember. I actually fixed a power section in an deuce. Guruman is spot on, exactly what I saw in the gutted amp.

I prefer to trash the output board entirely.
I mount new ceramic tube sockets to the chassis, and re-wire it just like an old Fender.
Once the board burns, the fiberglass is like a resistor. You can't really get rid of the carbon threads.
(they don't clean off)
Once upon a time, PV had new boards, but I can't say that they still have those available.

[überfuzz]

I prefer to trash the output board entirely.
I mount new ceramic tube sockets to the chassis, and re-wire it just like an old Fender.
Once the board burns, the fiberglass is like a resistor. You can't really get rid of the carbon threads.
(they don't clean off)
Once upon a time, PV had new boards, but I can't say that they still have those available.

Sorry if I'm hijacking. Thanks dude. I was planing to rebuild a deuce into a 100w twin reverb. I might have to rethink...

[Daddles]

sorry if i'm hijacking. Thanks dude. I was planing to rebuild a deuce into a 100w twin reverb. I might have to rethink...

thanks guys, unfortunately been to busy to investigate but will let you know how i get on.

[Daddles]

Peavey Deuce valves.

Well after changing most caps to no avail, I decided to take out all valves with the power on - no noise as you would expect. Then I plugged them back in one at a time trying each socket with each valve using the new replacement valves I'd bought in the first place to try to eradicate the problem. They each brought the offending noise back.

Then I plugged in some borrowed valves and they were quiet.

Seems my original noisy valves were replaced by new noisy valves even though these were bought from a specialist Guitar valve supplier and were Tesla 6L6's and weren't cheap.
Too late to send back now, had them over a year.

Cheers

Tony.

[überfuzz]

Well after changing most caps to no avail, I decided to take out all valves with the power on - no noise as you would expect. Then I plugged them back in one at a time trying each socket with each valve using the new replacement valves I'd bought in the first place to try to eradicate the problem. They each brought the offending noise back.

Then I plugged in some borrowed valves and they were quiet.

Seems my original noisy valves were replaced by new noisy valves even though these were bought from a specialist Guitar valve supplier and were Tesla 6L6's and weren't cheap.
Too late to send back now, had them over a year.

Cheers

Tony.

Not sure anyone ask if you had tested known good tubes. But hey, next time you'll know.