Peavey Decade amp, noisy pots, replaced with new, still noisy?

[Kenrod]

Yes, 2 pots and 3 caps. Seems like it was quiet with the chassis on the bench, because the pre and post gain were both all the way up, but when I re-installed the chassis and powered it back up I had this hum that is only present from 9-10 on the post gain.
I must have done something on re-assembly. I'll look at grounds and such, also making sure the legs of the 2 non-board mounted pots aren't touching anything they shouldn't.

[Kenrod]

An update to the issues: I've most recently only been listening to noise level at pots (no input). Yesterday I injected a signal and found it very low. I checked supply voltages (for lack of other test point info) and found the 24V present, but found the 23V to be only 21.7 and the 11V at only 8.7V at the power supply section.
Perhaps if I can't drive the IC with the required 11V I'm not going to get the proper output?
Any ideas what's going on?

[52 Bill]

A couple of questions. Which output chip do you have in this amp? The problem now is low output?

[Kenrod]

TDA2004.
I must have done something to it with all the assembly and disassembly of the board in the chassis.

[52 Bill]

TDA2004.
I must have done something to it with all the assembly and disassembly of the board in the chassis.

Have you tried injecting a signal directly into the power amp section? Have you tried to monitor the output from the preamp section?

Some of your voltages are a little off, but not enough to be concerned about.

[Kenrod]

Sorry for the delay, here's the update:
I traced the signal with my audio probe and found output from the "A" half of the op amp, but no input at the "B" half. It sounded "grounded" if that makes sense. I started listening all along the path and found input on the incoming side of the cap, the one right before the input pin on the op amp. This is the cap I replaced to clean up the "DC on the pots" problem.
Result was I found I had left the cap legs untrimmed and one got bent over and touched the adjacent ground trace. I trimmed the leg off and all is well.