I was using my 400+s power section to record today and all of the sudden it started to smoke. I'm very bummed cause my guitar and bass amp went down 1 day apart. Anyway I opened the bottom of the 400+ up and what looks like a big resistor on one of the sockets is cracked in half and black. It is fried... ALL of the other smaller, what look like resistors, on that row of the tubes have a small black bubble in the middle of them. The rest of the big resistors in that row look fine. The other row of the tubes' resistors all look fine. Does anyone know what happened??? Or can anyone give me ANY info on what could have happened? Thanks guys! Jim.