> I have been following this thread with some concern. My oil filled
> capacitor measures
> 4 3/4" X 4 1/2" X 9 1/4", its markings are as follows. General Electric,
> Capacitor, Made in U.S.A.,
> 25F492, 25uf at 4000 VDC. How can one tell if this capacitor is suitable
> for a HV power supply.
It can be very hard to tell - if it was designed for low duty
pulse discharge the designer could concentrate on size, weight and
price without worrying much about getting heat out from the
inside. In a PSU heat generation is more sustained and it could
end up cooking on the inside before you notice it's getting hot on
the outside. Some people have similar caps which have run for
years, others have them fail in a few months.
If you decide to use it, I'd suggest fusing the transformer
secondary so things are protected if the cap goes short.
Steve
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