Thread: 10KV caps.
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Old 02-15-2020, 08:57 PM
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JohnCT JohnCT is offline
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I decided to move along a bit on the Andrea, and brought her up on a variac. A can filter refused to reform and decided to puke itself, so I pulled the 40/500 - 40/500 and restuffed it.

I found the B+ normal and nothing running hot. The HV was around 1500v, so I checked the two 1B3 rectifiers, damper, and horiz output tubes. Interesting, this TV uses two HV rectifiers as a doubler - something I'd never seen before. I image the plan is to improve the reliability of the flyback.

The tubes checked good so I pulled the two 470pf 10KV caps I suspected might be an issue at 70 years old:



I found one reading very little capacitance and some leakage at 600V (the most my Z meter will provide) and the second one decided to become a 15 ohm resistor.

Probably explains my low HV...

I'll take the doorknob out next and check that. I'll order some ceramic caps and see if she'll run.

John

Last edited by JohnCT; 02-15-2020 at 09:02 PM.
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