Original poster: "S & J Young" <youngs-at-konnections-dot-net> To all those who trust in Spice and the like, The URL below is an interesting piece by Bob Pease (of National Semiconductor fame) regarding how "helpful" modeling is ... or isn't. I would think his wisdom certainly applies to modeling of Tesla coils. --Steve Y. http://www.elecdesign-dot-com/Articles/Index.cfm?ArticleID=5632