To continue on from my post about output tube glowing and hum. It seems like I got the problem fixed for a short time. One of the outer tubes (EL34s) would glow bright red in the center and the amp would hum. I found a broken wire at the tube socket and had it fixed. Well I used my old tubes again and lightly tapped on the one to listen for micro-phonics and all the sudden that tube glowed red in the center and made the to 6L6s glow and then the amp shut off. It blow the fuse and also had a little smoke coming from one of the 6L6s sockets. I waited a few minutes and pulled the chassis to look inside and found nothing burnt but, the one socket from underneath. Is it possible that it only damaged the tubes and tube socket and not the transformer? Please help!!!!!!