Hi I wonder if someone can help. My Dr Z Maz has gone down for the second time in a few months. It works for about 30 minutes and the just fizz's out, 2 of the power tubes at the back are glowing redhot . Ive had it repaired once in the last few months and had the tubes replaced but the same problem keeps happening and id rather not take it back to the place that fixed it last time as I now don't trust them.
Look at the Grid resistors ( 1.5K ) which are mounted on each output tube socket. Pay close attention to the two tubes that are glowing , and look to the jumper wire that connects the two grids. I would just re solder those connections first , melt some solder on the pins. Then change the two tubes that glowed. They probably are still good , but once they runaway they can't be trusted, so replace them.
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