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Original poster: Mike <megavolts61@xxxxxxxxx>

Hi Chris,
If you match the impedance of your NST ( which equals 12000/.03) by using the equation:

C = 1/(2*pi*f*Xc) you will have C = 1/(2*3014159*60*12000/.03) and get 6.63nF. If you use this, you can cause a resonant rise of voltage in your NST and possibly fry it. The value of 10nF, or 0.01uF will ensure your cap can take all the energy from the transformer safely for the transformer. If you use both of the caps you were talking about (.1uF and .03uF) in series, you'd still have .02uF. You can make that work. you will just have a lower gap voltage and unless you have a LOT of turns on your secondary, it could prove harder to tune. Still not that big a deal.

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