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I have various piles of old caps, many NOS, etc. I'm interested in doing a simple go/no-go type of test for leakage.
Have power supplies that can do 0 to 3kV DC.
Is it practical to put the cap in series with a microammeter (mechanical, to not risk damage to a DVM) and a current-limit resistor, then just dial up the voltage up to the rating of the cap (or beyond)?
One part of my question is: When (for example) a paper coupling cap goes leaky, just how leaky is it?

If a (for example) 20uA full-scale meter would not be sensitive enough, perhaps I set up a triode tube with a rather high-value grid R, and see if a leaky cap is able to change the bias.

Thanks for any comments!
Pete