Better safe than fried. Did you ever get those noisy controls fixed?

A Pictorial Guide To Biasing Carvin Tube Amplifiers

WARNING: During the course of biasing, you will be exposing yourself to dangerous voltages up to 400+/- volts D.C. If you feel at anytime that you are not sure of what you will be doing, don’t do it. It is recommend that you practice each step several times with the amp’s power cable unplugged so if you make a mistake, you will not pay for it with a damaged amplifier or a damaged body.