Original poster: "S & J Young by way of Terry Fritz <twftesla-at-qwest-dot-net>" <youngs-at-konnections-dot-net> List, For an interesting diversion into the past, and perhaps some ideas about spark gaps, have a look at this site. See some "medical" applications of TCs and Oudin Resonators. http://www.albany-dot-net/~zardoz/sparks.html --Steve Young