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In Reply to: RE: Russian MBGO .... Question..... posted by Michael Samra on September 18, 2014 at 21:26:34
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: 09/19/14Follow Ups:
Excellent info.
Honest amplification is better than excessive 2nd order distortion anytime.
Thanks, I do MBGO resistance checks as per your information. Very good !!
Jeff
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