This is a Royer oscillator which is a relatively high power self resonant circuit useful for generating high voltages from flyback or other ferrite transformers. Output is probably around 2000 VAC. The arc stretches out to about an inch at a power of up to 300 W.
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This 300 kg x-ray transformer 60 kV DC at 300 mA has 3 phase 240 V 45 A input. It is capable of making an arc drawn out to 2 feet just on 1 phase 240 V so it is a serious piece of HV gear.
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The second version 4 inch diameter Tesla coil uses much higher power components.
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A capacitor bank dumps 3 kJ of power into an iron wire for dramatic exploding wires effects.
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