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PFC Capacitor Primer

	I just found a capacitor - 500µf @ 370VAC, and I was taking some
measurements with it to see if I should use it as a PFC capacitor for my
rediculously large NST bank on my Tesla coil.  I took out a random electric
device, I didn't know the amount of current it pulled but it ran from 120v.
 (The measured voltage in that particular outlet was actually 118v.)  When
I hooked it up with the capacitor in series, the voltage read ~236v, thus
the current pull by the device was cut in half (I guess :-)).
	I took a 12/30 NST from my garage and hooked it up to measure it's current
draw: Exactly 3 Amps.  Then I connected the capacitor in parallel with the
NST's primary like you're supposed to do with PFC caps, and the NST still
worked fine, but I couldn't get an accurate current reading.  Any ideas? 
It would be really nice if I could use this sucker for a PFC cap, because I
am pretty desperate need of one.  Wintesla reports that I need a 308.7µf
capacitance for a PFC factor of 75%.

	Thanks,
	    Ryan Ries