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I've been replacing all of the paper caps whether they're good or not. I've been testing them out of curiosity and have only found a couple of good ones. Most have very high leakage. The ones that tested good also lacked the bubbled surface. Though some that looked nice were still bad.
The set came from Georgia so there was plenty of humidity around to absorb.
Replacing all paper caps is the one recommendation that I do follow. I've seen enough of the damage that they can cause. Besides, when testing them I always see the leakage current increase over the period of time I test them. That has to be a bad sign.
I'll probably start following the same advice for electrolytics after I get burned for ignoring it.
John
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