Two rewound MOTs each with 3 turns of #2 gauge insulated wire. Primaries wired in parallel, secondaries in series, melting through a 4" 1/8" steel rod
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https://www.youtube.com/watch?v=h9agqsg6BeY
My original lashup of my own driver circuit based on a 555/mosfet schematic modified for high power. Power supply based on Steve Ward's class e sstc circuit. 75v input.
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https://www.youtube.com/watch?v=YH5vRk278nE
My first attempt and lash up of a simple class e sstc based on Steve ward's design with slight modifications. Mosfet is irfp250, Mosfet driver is UCC37322. 75v then 150v.
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https://www.youtube.com/watch?v=3kzEFmc7Lu0