Hey guys, dont know where to ask about my guitar amp, but maybe someone here has some ideas? I have a fender 1000 amplifier head. i bought it new about 5 years ago. After about a half hour to an hour, with loud volume the sound will start cutting in and out, which makes it hard to play with the rest of the band I have changed cords, guitars ect,, so i know it has to be in the amp somewhere. I also notice that when it does this, if i tap on the head, that sound also gets amplfied. Very strange. It has a pre-amp tube, but the rest is solid state. Any ideas?