Re: large caps

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "by way of Terry Fritz <twftesla-at-uswest-dot-net>" <Mddeming-at-aol-dot-com>



Original poster: "Matt Skidmore by way of Terry Fritz <twftesla-at-uswest-dot-net>" <
fox-at-gwydion.woozle-dot-org> 

<ive recently found a large cap rated 15,000 VDC and 600 VAC at 60 MFD. i 
was wondering if this might be a good cap to use on my coil using a 15/30 
NST power supply even though its only rated for 600 VAC.> 

Hi Matt S. 
I believe it might work in an AC coil ONCE, but then perhaps best as a 
fusible link, a detonator, or a hot oil spreader.   ;-) Your 15/30 NST has AC 
peaks of 21.2 kV! Anything rated less than 20 kV AC is, in my opinion, on 
shaky ground. At the proper voltage rating, a 60 MFD tank cap would fit 
nicely (LTR) with a 200+ KVA super pig, not an NST. You might want to 
consider something in the 0.01 to 0.02 mfd range, rated 20 kVAC or better for 
a 15/30 NST AC Coil. In a DC TC, it probably wouldn't fry, but your tank 
frequency would be super low, given the dual constraints:       
f=1/[2pi*sqrt(LC)] and R<2sqrt(L/C). 

Matt D.