First version of spark gap TC: Xformer: 2x6kV 50mA NST in series, Capacitor: 24x25nF 10kV polypropilene film foil series/parallel for 16.6nF 60kV total, single spark gap, pfc corrected. 23" max spark length. Second version will have a flat spiral copper tube primary and 12kV 200mA NST multiple SG.