Optimum capacitor size

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Original poster: "by way of Terry Fritz <teslalist-at-qwest-dot-net>" <MARTINJFRYML-at-aol-dot-com>

Hello,

As I wrote before,I have a relatively large secondary coil-about 2500 ft.,
12.5" dia, 50" high.
Per Dr. Resonance's suggestion, I am increasing the size of my toroid (to
30.5" x 8"). I have a rotary gap and am planning to use 4 or 5  12000/60 
NST's
in parallel.  What is the optimum capacitor size or size range for this system
for best performance.

Thanks.
Martin Fryml