After measuring a few more no apparent rule of thumb emerges. The ASC Spearinol above was of Japanese manufacture (brass terminals.) An American ASC 60uF of identical case size measures ~100 pF. A large 30 uF, 660 volt GE oval Dielektrol clocks in around 500 pF. An Aerovox 18 uF 370 volt Supermet measured below 50 pF. The smallest on hand, a 6 uF SEL MP, is around 100 pF. These measurements were made with a Fluke 87 and flying, spaced leads for what it's worth.
soundbrigade said:
Not in a coupling position. Do due diligence to ensure safety by wrapping the body with insulation and keeping it out of reach. Or use something else. The graph below demonstrates what happens when a sample of the caps I measured have their cases grounded and are driven with an 12ax7a no-load.
Edit: these are simulations.
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