Events leading to the current state of my beloved peavey: My brother borrowed my guitar amp, and could not find a patch cable, so he takes it off my peavey without telling me. The next day, a friend of mine comes to the house and goes to play it while i am in the kitchen. Eventually he calls me in and at this point, the red light above the standby switch does not light up. The tubes, however, were all lit up just fine. He said he heard it making a crackling noise when he tried to play, and i know this had to be soming directly from the head, given that the cab wasn't hooked up. So i figure something popped because of running it without a load, if anyone can tell me what i probably tore up, it would be greatly appreciated.