I'll assume the pri/sec resonance matching is correct, but the thing that jumps out as a glaring error is the total spark gap length of 1.07". Way too big, by a factor of about 5. Regards, Gary Lau Waltham, MA USA Original poster: MaverickIce00-at-aol-dot-com <snip> Spark Gap Specs: Type: Series Static Sections: 10 Overall Gap Width: 1.0714" Electrodes: 1" diam. 2" long copper pipe <snip> - Joshua