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RE: Russian MBGO .... Question.....

I tested many capacitors for leakage over time using high voltage. The Russian capacitors are typically over- built. I operate K40Y-9 at rated voltage and have no issue of over-voltage during tube warm up time. Never found or had a K40Y-9 failure. The K40Y-9 does not leak more than two micro amps at 1.5x the rated voltage or well within safe operating parameters. Same goes for the Russian Teflon capacitors. Where room exists, I do prefer some voltage reserve though.

However, the subject capacitor MBGO is not a K40Y-9 or Teflon. Some faulty NOS MBGO exists. Measure the resistance across the MBGO. Bad caps will show as low as 200K ohms. Others measure in the 10+ meg ohm range. I would not have an issue using up to 200 volts on a MBGO measuring 10+ meg ohms. If this application was NASA flight critical though, I would be 'out' for sure.



Edits: 09/19/14

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