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Running an amp that has sat idle for years opens up the Caps that may have dryed up
Sounds by your description that certain frequencies that were previously filtered ae getting through.
But what do I know, you need specific test equipment to fault isolate your problem.
Just swapping out the caps may do more harm then good.
Fist swap your tubes and if that doesn't fix it have the amp brought back to spec by a good amp technician.
You don't want to replace vintage tone shapers with any old cap of the same or different value. different caps interact with different results.
Does Brinsley Swartz still repair amps in London?
I'd try to find him
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