Secondary: diameter 3-3/8" winding height 16-1/2" wire #24 stranded, plastic coated turns/inch 30 wire length 133.3 meters frequency ~560 kHz --- based on length in free space ~540 kHz --- based on wire propagation factor discharger 5-1/2" sphere Primary: type Archimedes spiral wire #8 solid copper inner radius 2-3/4" between turns 5/8" tapped 4-1/2 turns Capacitor .00866 salt-water (wine cooler bottles) .00865 rolled poly Spark gap single - static (8 x 32 bolts, adjustable) Spark lengths 15" with 1" gap and salt-water cap 19" with 1-3/16" gap and rolled cap Power supply two 15 kV, 30 mA neon sign transformers protection two 2-1/2" diameter ferrite toroids wound ~30 turns #18 solid copper magnet wire Ground 1" water pipe ~3 feet in earth (formerly CB ground) wire #8 stranded ~18 feet in length run into basement Other details - 20 amp Variac - no safety gap, as we are still under 1 kW