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https://imgur.com/a/A26YpI9
"Take these three items, some WD-40, a vise grip, and a roll of duct tape. Any man worth his salt can fix almost any problem with this stuff alone." - Walt Kowalski
"Only two things are infinite - the universe, and human stupidity. And I'm not sure about the universe." - Albert Einstein
Bypassing it will work fine if you don't intend to use the loop.
"Take these three items, some WD-40, a vise grip, and a roll of duct tape. Any man worth his salt can fix almost any problem with this stuff alone." - Walt Kowalski
"Only two things are infinite - the universe, and human stupidity. And I'm not sure about the universe." - Albert Einstein
I see the bottom input has the same kind of jack, I'll give that a clean too while I'm in there.
Its lovely outside, beer drinking in the garden weather! Sods law.
https://i.imgur.com/VpR9O96.jpg
https://i.imgur.com/oUTeB3r.jpg
https://i.imgur.com/genMJpj.jpg
https://i.imgur.com/trCfmNa.jpg
And this is on the other board.
https://i.imgur.com/HiqI2ek.jpg
Im thinking that might be the problem,
Check that the large blue resistor in the top left corner of your third pic isn’t loose.
Is it working with the jack switch bypassed?
"Take these three items, some WD-40, a vise grip, and a roll of duct tape. Any man worth his salt can fix almost any problem with this stuff alone." - Walt Kowalski
"Only two things are infinite - the universe, and human stupidity. And I'm not sure about the universe." - Albert Einstein
Anyhow, that's enough of me moaning, clean the speaker terminals next, something somewhere along the signal path is showing resistance and letting go. I will check the resistor, to be fair a dry solder joint does sound likely,
There are quite a few other possibilities for what might be causing it too, but it will probably just be a process of elimination.
If the seller replaced two valves they may have been visibly dead - if it's been stored in a garage or somewhere and got very cold, they can crack and it's very obvious that they are, the silver 'getter' goes white. In theory this shouldn't happen at UK winter temperatures, but it does. Garage storage would also be likely to produce corrosion elsewhere too.
"Take these three items, some WD-40, a vise grip, and a roll of duct tape. Any man worth his salt can fix almost any problem with this stuff alone." - Walt Kowalski
"Only two things are infinite - the universe, and human stupidity. And I'm not sure about the universe." - Albert Einstein
If the reverb kept on going after the main sound cut out, you can definitely be sure the fault is not in the power amp or speakers.
"Take these three items, some WD-40, a vise grip, and a roll of duct tape. Any man worth his salt can fix almost any problem with this stuff alone." - Walt Kowalski
"Only two things are infinite - the universe, and human stupidity. And I'm not sure about the universe." - Albert Einstein
Sounds like there is something up with the switching circuit.
Check that all the ICs in sockets are properly seated - give each one a firm press.
"Take these three items, some WD-40, a vise grip, and a roll of duct tape. Any man worth his salt can fix almost any problem with this stuff alone." - Walt Kowalski
"Only two things are infinite - the universe, and human stupidity. And I'm not sure about the universe." - Albert Einstein
I'm guessing this is a thermal issue? A dry joint isn't convincing me because if I smack the amp it doesn't change anything!
"Take these three items, some WD-40, a vise grip, and a roll of duct tape. Any man worth his salt can fix almost any problem with this stuff alone." - Walt Kowalski
"Only two things are infinite - the universe, and human stupidity. And I'm not sure about the universe." - Albert Einstein
"Take these three items, some WD-40, a vise grip, and a roll of duct tape. Any man worth his salt can fix almost any problem with this stuff alone." - Walt Kowalski
"Only two things are infinite - the universe, and human stupidity. And I'm not sure about the universe." - Albert Einstein
It was very hot in here today, that wouldn't make a difference would it?
My guess is that unless the valves were visibly faulty, the two things are completely unrelated. Even if both of the faulty valves were on the same side of the amp, it would produce a fairly strong output, but oddly distorted at higher volume. If it was one on each side the amp work work fine but just have a little less maximum output volume. Unlike many later Peaveys, the valve filaments aren't in series on these, I'm almost certain.
Just turning on an amp which has sat unused for ten years isn't the best idea really...
"Take these three items, some WD-40, a vise grip, and a roll of duct tape. Any man worth his salt can fix almost any problem with this stuff alone." - Walt Kowalski
"Only two things are infinite - the universe, and human stupidity. And I'm not sure about the universe." - Albert Einstein