Well I've upped the frequency to about 1.5kHz and the efficiency improved a lot, I went up to full line voltage and got some fat 8-9 cm arcs, and one fan blowing against the coil kept it well from overheating. Video first, more after interest shows up. Ideally, the output should be fullwave rectified before being fed into the coil. I would like to see if someone could dare to use one like this to power a sgtc. Results - didn't go to full voltage yet, but runs at 150V or so pegged the 5 amp meter and produced some fat, MOT-like arcs, and ignition coil heating up fast. I used a 33uF bipolar lityc here, and 100 ohm gate resistors on the mosfets. The only important difference from tipycal flyback and whatever drivers is that the DC blocking cap used before the gdt's has to have a lot more capacitance than usual, to support the magnetizing current at such low frequencies. I used TL494 with some bjt totem pole output amplification - something that has been used so many times over and over here that I'm sure everyone knows how to use it.

Small ones from dial up modems would also be great. Instead I used small iron audio transformers, one from a telephone and another from a modem in my case. I also wanted to avoid the use of troublesome and expensive high side driver chips. I wondered whether it would work to use a half bridge of IRFP450's with line voltage supply (ok, with a variac in between for start). I wanted to see if it could be used more as a normal transformer rather than in flyback mode, in hope of seeing some higher output current and lower voltage. So I started wondering whether something could be done to make iggies more useful as power supplies without overly complicated electronics. It's also normally not possible to run these from mains without a step down transformer. This works to a point and tends to produce very high voltage pulses, but overall power throughput and efficiency remains quite low. Yet for some reason I've never seen anything more advanced than a NE555 and a 2N3055 or a mosfet driving it in flyback mode. Very often beginner tesla coilers tend to use ignition coils as their power supply. They are deserving of my most heartfelt thanks.

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How to build a ignition coil driver