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Dear Doug Reminds me of my first experiments ... May I suggest: 1.Build a larger toroid, minor d more close to secondary coil d, major d more close to winding length of sec. coil. Try to achieve a smooth surface. 2.Lower the primary coil, lower end a few mm below secondary coil lower end. Adjust later relative hights, = coupling, for best spark length, observe for, avoid racesparks, if this problem occurs, lower the primary more. I am not sure, if the very steep primary coil angle is ideal -? When system is perfectly tuned, possible problem of flashovers primary - secondary and toroid - primary. 3.Search later for a NST with higher sec. voltage. 4.Get used to Javatc. 5.Studie all the informative expert homepages. Have fun! Fritz <<Doug Johnson here; I finished assembling my small coil, complete on its 8 inch base and made a short video of it in operation. I am using a 6kv-30ma NST to power it. The caps are 2- 102-30kv doorknobs, the secondary is 6.5 inches of 24 awg on a 1.5 inch coil-form. This is my second coil, the first one I had a set of plans for, and this one was designed using Teslamap and asking MANY questions of Bert Hickman, which he showed great patience in answering! {thanks Bert} Here is the video. https://youtu.be/mqqd1vPy8Ko Doug J>> _______________________________________________ Tesla mailing list Tesla@xxxxxxxxxx http://www.pupman.com/mailman/listinfo/tesla _______________________________________________ Tesla mailing list Tesla@xxxxxxxxxx http://www.pupman.com/mailman/listinfo/tesla