for some reason here lately my triple XXX head has had this loud buzz/hum. almost as if I were standing right infront of a tv or computer. but nothing is on. it's not noticable on the clean channel, a little on OD1, and very noticable on OD2. could this be a bad connection somewhere, or could one of the tubes be going bad? It still sounds good, only with the extra buzzing hum. it's never done this before, and I've only played it 3 times since it started, mainly to see if it was still doing it (which it was). Any help will be greatly appreciated! btw, I'm still kind of new to tubes, so go easy on me if it has something to do with them...lol