I can only think of one more thing to look at.
I have seen many amps where people have spilled drinks on them. A lot of times the drink will get inside the amp. The alcohol evaporates, but the sugar and whatever else was in there will be left behind and cause problems for a long time.
Sometimes you can easily see the residue and sometimes you can't. Try cleaning the board, chassis and especially the tube sockets with a good solvent and see if the noise goes away.
If not, I am out of suggestions.
Steve
I have seen many amps where people have spilled drinks on them. A lot of times the drink will get inside the amp. The alcohol evaporates, but the sugar and whatever else was in there will be left behind and cause problems for a long time.
Sometimes you can easily see the residue and sometimes you can't. Try cleaning the board, chassis and especially the tube sockets with a good solvent and see if the noise goes away.
If not, I am out of suggestions.
Steve
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