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Also when the amp is powered up with no speaker connected there is a strange squealing noise coming from the amp
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Probably the output transformer protesting, don’t run it without a load of some kind, speaker, low value resistor.
Change those components, they will probably be out of specification, confirm the cathode components are good, they may be in that list from Michael to replace.
I am just wary of saying get two new valves at the price they are.