Khron-Hite UHR-220 tube power supply

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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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Bob Hedberg
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Interesting that Krohn-Hite still exists: I have two lab amplifiers (DCA50) from them, 1963.
Has regulated tube regulated (6AS7) supplies of + and - 260V, virtually no ripple, very high bandwidth (square wave response flat 0-100KHz is 200Vpp on 200 ohm) from this beast.
albert
 
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