[AMPS] Vacuum Capacitor Voltage Rating

[Michael Tope" <W4EF@dellroy.com (Michael Tope)]

I have a vacuum cap that was pulled from an old homebrew amp that
I picked up in Florida a few years ago. The part number markings on the 
cap are as follows:
            
                        Jennings Type "UCSX"
                         C746749 C1825
                         20 to 675 MMFD

Scratched into the copper outer cylinder is the following:

                           UCSX-740                    

The cap is about 8" long (from shaft coupler to back end) and about
3 1/2" in diameter. Is there any way to tell what the voltage rating is 
for this part short of doing a hi-pot test?

Thanks,

Mike, W4EF.............


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