Peavey Delta Blues

Barry got it! The OP states that "it is a solid amp" and I read that as "solid state amp"! My bad.

99% of issues with tube amps are tubes. I take it you have tried replacing tubes? The EL84s would be the first place I would look. Also, I recently watched a video by Psionic Audio on Youtube about servicing a Classic 30
. It was quite interesting. The filter caps are inexpensive IC brand and I would be changing those to F+Ts. The fella from Psionic really seems to know his stuff.

The way the circuit boards are connected looks like a recipe for disaster! Who ever thought that was a good idea??
I Just started following Psionic Audio’s youtube channel. Some great videos!
 
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Yeah he raises some interesting points. The video about the Bluesbreaker RI was particularly interesting because he shows what can happen when manufacturers break one of the cardinal rules of amp layout.

Music 6000 - a friend of mine had that exact problem with a Peavey - I think it was a 5150. The FX loop sockets became slightly corroded so sometimes his amp would completely cut out, even during gigs. The fix was as simple as cleaning the loop sockets.

And even Switchcraft sockets can cause problems. Another friend has a Fender handwired Low-power tweed Twin RI and was getting a lot of crackling noise. He had changed tubes to no effect and I had recently changed the filter caps in the amp for the previous owner so had checked that it was all good inside. Turns out it was the input sockets failing to short to ground. Even bending the tabs inside and a thorough cleaning couldn't save them so they all got replaced and no more noise.
 
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