I killed it. Had to replace a broken pot, and some of the contact for one of them came off. This sucks. I either have to use my tube guitar combo's amp section, or use an old crate solid state head. This really sucks. I know I won't be able to have it repiared by this weekend... Ugh. Has anyone else had to replace their preamp board in one of these? If you have, could you tell me about how much it cost?