Thanks for the upgrade on induced voltage, TKG. I guess in the smaller coils more primary voltage is necessary to get proper seconday output. Time to reactivate my "electronics dedicated" brain cells and study this circuit a bit more closely. Since I'm constantly trying to "reinvent the wheel" anyway, maybe I can find a way to just ditch the external timing circuits normally found in these units and develop a simple, bulletproof,and adjustable circuit for timing control. Seems a serial time delay circuit, with less delay as frequency increases, would be the simplest design, and no chips involved. Add in a couple of variable resistors or inductive cans for tuning, and you'd have an infinitely adjustable timing curve.