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Years ago, someone gave me a KV1981R that they found at the dump. The speakers had been removed and the flyback transformer was arcing to the heatsink. Not knowing what kind of shape the tube was in, I junked the set.
I've also had the 19" version of that 15" set and I seem to remember having that shutdown problem. It's been a long time; but, I think the B+ regulator was shorted. The shorted regulator caused too much B+ voltage to be fed to the horizontal output stage; which, triggered the shutdown circuit. You can probably run the set through a variac and make it stay on for troubleshooting purposes.
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