Well lets say very little, kind one of those dream finds less than 100$ any idea where i can get handle covers? this amp in very good cond and othere than scrathy pots, awsome tone, evrything appears to function proper, i realy luv it, im not gigging but the power is unreal i just retubed and bia'ed it at 42ma and not sure if this is correct, also pt runs a little hot not frying but not cool, i need to go through voltages and clean up pots there appears to be no replacement parts all cde caps, love the way these amps are built like tanks, thanks mark