my 300T keeps popping fuses in the middle tube set. first time it did it i figured a tube was bad, so i retubed, rebiased, replaced the fuse, and played for about a couple of days before it started blowing fuses again. now i'm not sure if my original or replacement set of tubes is any good, or where the problem lies, but fender is no help. the service manual would be a huge assist, since i can't afford to take it to anyone right now.
thanks, brian