Third pic not that clear, but red & white wires are for the picture tube focus & screen voltages & are controled by the 2 pots on the side of the transformer. The blue circled pin is a ground, not part of the flyback circuit. The red circled pin is part of the flyback circuit & is switched to ground by the mosfet/transistor. The other part of the flyback circuit is probably the pin to the left of the red one. There should be continuity betwean them, that pin will be fed by about 100V DC aproximately. This is where it could get dangerous!! Personaly I wouldnt recomend using a TV/Monitor flyback transformer for your plasma project due to the high voltage required for that type of transformer. An Ignition type of transformer would be mutch safer due to the lower voltage required to drive it. Ive only posted this stuf on TV/Monitor flyback more as how it works for your interest. Another point these types of transformers the HV is rectified inside the T/F, you need HV AC not DC.
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