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I think this may be a case of nature of the beast. I friend of mine was in the shop today and said 2 out of 3 of his Mesa Boogie amps have the same quiet hum. Like I said in my last post, other than that, the amp absolutely screams. Robert, thank you for that link. I had stumbled upon that...

Thanks for the tip, I'll look into that. Would that make a difference if the tank is unplugged though? I do hear a small amount of hum when I turn up the reverb but it is higher in pitch. Today in a regular shop setting the low hum isn't that bad at all and even when playing very low it...

Hello all. A friend of mine brought me his Mark I from 77 to see if I could get it up and running. I build custom guitars and do high end repairs on all stringed instruments but generally stay away from regular amp repair, only for good customers. I have a basic knowledge of tube amps and can...