I have an AC15c1 I use when playing bars and stuff so I don't have to drag my UK around everywhere. Last Tuesday, I notice a sort of fuzzy undertone to the sound in the low end, but managed through the gig ok. The next evening it clicked that it was probably tubes, and I had a set of matched 84's so I swapped them and it seemed to fix the issue. Worked fine Friday night. Well, Saturday the damn thing kicked on with a weird static-like sound, and nearly all the volume was gone, and what was still there had that fuzzy sound. I killed it and replace the pre amp tubes with the last set I still had around, and that didn't change anything. The volume did come up to full and clear a couple times very briefly, but right back to almost nothing. Anyone have any tips on what is happening here? I've got a new full set of tubes on the way. Was it the pre amp tubes to begin with, and they cooked two sets of power tubes? Nothing to do with the tubes (i.e. speaker cable?) Or is it something else more major?