Khron-Hite UHR-220 tube power supply

[bobhedberg]

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
__________________
Bob Hedberg
Report Post Reply With Quote

 

[tomchr]

Manuals Plus: Find has several.

~Tom

 

[bobhedberg]

Thanks, I know I can get a manual. I was hoping someone had a schematic. I'm not spending 30 bucks on a photocopy manual. I'll scrap it first.

Anyone have just the schematic so I can follow the components?

Thanks,
Bob

 

[bobhedberg]

Emailed Khron-Hite, and sales found the last manual they had and emailed it to me as a PDF. No charge.

That's what I call a great company.
If anyone would like it, let me know.
Bob.

 

[triode_al]

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

 

[stevebyan]

Bob got the last manual from Krohn-Hite and Manuals Plus is out of business. Does anyone have a scan of the manual? I'd sure appreciate a copy.