Khron-Hite UHR220 tube power source

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Hi

Does anyone have a schematic for a Khron-Hite UHR-220 tube power supply?
It works for about 10 minutes, then the voltage rises to about 250 V, and still varies.
I suspect the regulation feedback is opening somewhere and it's running full tilt.
I'm tired of poking around the multitude of components, testing the tubes, and resoldering what I can get at.

Thanks,
Bob
 
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