First my Hartke lh1000 craps out on me, now my ampeg svt 7 pro. I was playing outside tonight and the amp starts cutting in and out, then completely shuts off. I check the fuse, and of course it has a white sleeve around it so I can't tell. I switch the 10 amp 250 volt fuse with the 6 amp 250 fuse from my practice amp and it still won't turn on. Would 4 amps make any difference? What else could it be? I live in a small town with no good repair shop.