Original poster: "Dr. Resonance" <resonance-at-jvlnet-dot-com> Yes you could --- if you have a $20,000 computerized coil winder at your disposal. Sec is 4,200 turns of #42 AWG and it's impossible to wind it by hand or even with a lathe. Requires an automated machine. Dr. Resonance > For that kinda cash you could get a giant core from an induction > heater and wind your own monster flyback.