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Actually the online calculators take numerical input for frequency and capacitance and or desired impedance do the math and give numerical output...
I think I used the same calculator to try and whip up a ballast for my TS-18, but the value given didn't produce the right results on the variac and experimentally finding the value showed me I didn't have the caps I needed on hand...I ended up temporarily making one out of resistors I had, and plan to order the caps I need next time I stock up.
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