Well, it's blowing fuses when the amp is on 10. Could this possibly mean the rectifier tube is dying? (after all, it IS a friggin 40-year old G.E.) Also, it only does it when I'm really screaming into the mic (I use it for the PA), and it actually distorts, THEN it blows the fuse. But it usually doesn't distort much at all, and the fuse has only blown twice, the first time it shocked me at the same time, then blew the fuse. When I got the power cord replaced, and brought it home, it was working fine. So today, I was practicing singing & playing White Room (lots of high loud notes), and on one of the really loud ones, it blew the fuse again (but this time, it didn't shock me). Does this sound like a dying rectifier tube?