i have a silverface Concert Lead that is not working. i opened it up and saw a burned out resistor on the back pcb. it was the second one from the left side in the very back (looking at the amp from the front). also, i noticed one of the concrete resistors in the back had come loose, so maybe that is what burned it up. this thing has been sitting around for like a year and i am never gonna fix it because i have other amps to worry about and i'm not rich. if anybody wants it, i will sell it cheap. i can get you pics of the inside problem area and the outside. it just sits at my practice space, so if anyone wants a fixer upper. let me know.