My Super Redhead seems to be on the fritz, and If anyone can offer an idea as to what the problem is I'd be grateful. I was practicing with my band earlier tonight, running my Jazz bass, which I just installed active EMG's into, through my Super Redhead. I had no extension cab connected, and I was going through a tuner with a compressor in my effects loop. About half an hour into the practice, the speakers make a very loud buzzing sound, and both my pwr amp and pre amp clipping led's light up. The sound and the lights lasted for less than a second. Afterwards, my rig was about 1/4 the volume it usually is. After checking my bass, all my chords, and turning everything off and on, I plugged out of the active input, and into the passive input on the Super Redhead. The sound was about 1/2 of my usual volume. The amp's casing was barely above room temperature at this point. I guessed that I had blown out the tube in the pre-amp of the Super Redhead. The amp is 3 years old, and the tube has never been replaced, so that seemed to make the most sense to me, but I am next to clueless when it comes to the workings of amplifiers. I was able to get enough sound through the passive input to keep practicing. However, in between songs, while I wasn't playing, my amp started to feedback loudly. I immediately turned down the volume and realized that the amp was working normally. I really have no idea what's going on with it, but I've got mad props for anyone who can offer me an idea.