The Peavey 6505 Mk2 without bias adjustment. Came in with low power and the bias resistor had burned up, one 6L6 was open circuit two others were less than 30% and one was 40% good. Replaced the burnt resistor, probably caused by output valve flash over, fit matched quad of 6L6WGC valves. What a sound. Almost as nice as a Fender.

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