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Last week I was working on a Peavey M-2600 amplifier. The amplifier was used at the local YMCA youth club and was repeatedly abused. There is an auto-limiter on the amplifier which can be disabled by pulling out the volume control knob. As this potentiometer is physically broken, the knob was pulled out all the time. Volume on max. Enjoying the distortion. It took a while, but the amplifier gave up a couple of years ago. It has been waiting for a repair in my cellar ever since. It sounded back then as if the final transistor stage had given in.