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.