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In Reply to: RE: Need replacement or rewind for 6288 posted by Stager Sound Systems on April 22, 2009 at 10:06:46
From your description, it appears the transformers are working. Is it possible that the tubes are losing bias and going into thermal runaway as things heat up? This could be leaky coupling capacitors, for example. Or a bad bias supply - the rectifier appears to be selenium, which have a reputation for failing with age; also the 50uF electrolytic capacitor is likely dying if it's original, or the bias pot may have a dirty contact.
All this is based on a cursory glance at the circuit, which I found here:
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