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Thanks to all for the replies. Yes, as I and most of you thought, it was an excessive 60 cycle ground hum. Turned out while working on the amp, someone touched the input jack and the chassis similtaneously, and the hum sudsided. A much closer look revealed that, during a previous repair, a...

Hi, everyone. Nice to be a new user... My son just bought a used .50 Caliber, ~1986 issue, 4 EL84's, 5 12AX7's (none from Mesa) and a lot of hum. Replacing the preamp tubes with new, low noise ones does not apprecialbly reduce the hum. Same for the EL84's. The hum occurs as soon as I plug...