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Old 7th Aug 2020, 4:59 pm   #6
Alan_G3XAQ
Pentode
 
Join Date: Apr 2018
Location: Canterbury, Kent, UK.
Posts: 189
Default Re: Capacitor voltage rating

I have a hi-pot breakdown voltage tester I use for valves and vacuum capacitors. I wonder if a lash-up version would be viable for your capacitors, assuming you are prepared to sacrifice one?

If you don't have a variable HT supply available then maybe taking a sample of the highest voltage in your restoration project would do? Connect several high value resistors (usually 300V working) in series with the capacitor and put them across the HT [insert H&S disclaimer here]. Switch on. If the cap releases its magic smoke then you know it is unsuitable. If not you could be more scientific and add a microammeter to measure leakage current and gradually ramp up the HT while looking for any sudden jump in current.

Or maybe the mods and others are going to tell you not to even think of trying such an experiment?

Cheers, Alan G3XAQ
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