1/13/2024 0 Comments Silverface bassman![]() ![]() I think Fender expected the clamping action of all those pot nuts would provide sufficient conduction between the brass ground bus plate & chassis. I would not expect a new one to make a racket, but don't rule it out. Looks like Mallory 150's, a favorite in my workshop. ![]() As you say, all the caps have been replaced. It could even be a piece of wire, I've seen that happen. I'd pursue the thump source first, tapping around with a chopstick. Also any light finger tapping of any section of the chassis produces a thump into the speaker.There's some possibility these may be related. ![]() There is a hum at idle (I think it is at 120 hz).
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