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Re: thanks!



Original poster: "D.C. Cox" <resonance@xxxxxxxxxx>



Bump your sec winding up to 30 AWG wire and use MMC caps. Also use a subdivided sparkgap consisting of a 6 inch ID PVC tube x 7.5 inches long with 4" x 5/8" OD copper tubes --- 8 sparkgaps, 9 tubes set at a max. of 0.310 inches (310 mils). Use a 80-100 cfm blower on bottom end of the tube.

You will be amazed at the increase in output spark length.

You can contact me off-list and I will email you the complete set of plans and photograph. It uses 30, 60, or 90 mA 12 kV xmfr with respective spark outputs of 20 inch, 28 inch, and 40 inches.

Dr. Resonance



Original poster: "Michael Rowe" <lozinit@xxxxxxxxx>

Just a quick note to say thanks to all the information put together on this list. It's truely an invaluable resource.

I recently finished construction of my first coil.

4.5" secondary, 22.25" winding of 24 awg.
Primary is 11 turns of .25" copper tube, spaced .25". Flat spiral design.
1 inch space from primary to secondary.
Geekgroup saltwater bucket cap. (Yes, all 12 bottles, maybe I should run 6 instead).
Very simple two brass sphere static gap. (Brass erodes really quickly I've found)
4"x13" duct toroid.
Franceformer 15/30 trans.
Wiring is all 10 awg stranded. (Except secondary ground, this is 4awg)


At the moment, I can't get more than smallish 6-7 inch purple steamers from the topload to air, and I am all the way out to the end of the primary.
I can get a bright white single streamer (with or without a breakout point) if I bring a ground rod within 9 inches of the topload.


Any ideas on how to increase the length of the streamers using what I've got above? Maybe a better sparkgap, less capacitance on the tank circuit, etc...?

It's been a very interesting learing experience thus far, and I originally started out using 2 MOTs and a doubler as a power supply, but kept blowing the 20 amp breaker within 3 seconds. Ballasting with a third identical mot in series with the 120 line did nothing but smoke the ballast with the secondaries shorted, and if I left them open, I got nothing at all from the power supply.
Ballasting mots is still somewhat unlearned for me at the moment, and in the meantime I am having fun with the nst power.
Anyone have any in-depth reading material about the theory of operation for this type ballasts?