My son (in Boise) has one of these and he enjoys it. Today he told me that he has a problem, and asked if I knew anything about it. Here's how he described the problem: "when i play my Orange Microterror for about 30+ min, it just loses all power, like the gain circuit is failing or something. So i can still play cleanly alright enough at that point, just the gain knob basically seems disabled... When it starts doing this, I can turn it off and on again and the gain works fine for a few minutes, then craps out again." I have done some searching, but I can't find a schematic. I know it's a single 12ax7 feeding a class-D power amp. I know nothing about how the 12ax7 is used. I kind of assume that the Gain knob is on one section, which feeds the second Volume section. But that is just a guess based on my old-school learning. Of course the obvious thing is to swap in a new tube. And I will tell him that. But I thought I would ask here first, and see if anybody knew anything or had any suggestions.