Hiya, Bout to play a gig tomorrow night with an old Tech 21 Trademark 60. Haven't gigged like this in a long time. To my disappointment, my amp's got some bad hum, like 60 cycle type hum. It's there even without the guitar plugged in. I'm trying to see if there's anything I can do last minute before tomorrow's gig. I noticed that when turning up the reverb knob, the hum gets WAAAAy loud. I'm thinking the verb has something to do with it? So I disconnected the RCA jacks to the reverb tank. Same issue. I found the other ends of the RCA cables that were connected to the mainboard. Disconnected them too. SAME issue. Any ideas? Perhaps it's not tied to the reverb at all?