Hi David,Your detuned rather high about 1.5 turns (meaning primary inductance is a little over 20% beyond resonance). This is a bit much, but you have to go with what you see as best (regardless). The highest I've detuned was near 13%. If I were you and were looking at what would help the coil perform better, two items come to mind. The first is the h/d. Your coil is a bit long for the diameter. Q would actually rise to approximately 375 (from 360) if you reduced the length to 4.5 h/d (about 280 turns removal). The second item I notice is the toroid size. I personally would suggest a 10" x 40" toroid. This would raise the energy storage capacitance from 33pF up to 50pF, so a significant increase and appropriate for the 4.5 h/d suggested.
Just some thoughts from looking at the coil parameters given. Regards, Bart David Kronstein wrote:
Hi all,I'm getting my Tesla coil up and running again, and I'm revisiting the design trying to improve performance. Currently the coil struggles to get 7-8' arcs with 10kVA input, with the spark gap firing at a capacitor voltage of around 20-24kV. The current specs of the coil are:Power: 10kVa 14.4kV pole pig, arc welder as variable inductor ballast Capacitor: 0.136uF 24kV MMC (originally 0.204uF) Spark gap: 240bps SRSGPrmary: 3/8" copper tube, 3/8" spacing, 13" ID flat pancake, currently tapped at 6.7 turnsSecondary: 20AWG, 8.5" dia, 48" winding length Toroid: 8" x 24" Fres: ~100kHzWhat would you guys recommend changing or upgrading to get better performance? I'm currently thinking of getting a variac to control input power, because the variable inductor affects optimum RSG phasing.Regards, David Kronstein _______________________________________________ Tesla mailing list Tesla@xxxxxxxxxxxxxx http://www.pupman.com/mailman/listinfo/tesla
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