The Turn Of The Century Electrotherapy Museum http://www.electrotherapymuseum.com Cip's Second Tesla Coil I modified the first coil to add a bit of fun to it... A nice beginning Tesla Coil Maximum spark is 4 - 6".  Coil is wound with double silk covered wire. Made from TIG HF Arc Stabilizer transformer, (2) .002 mfd mica caps, Miller 2-Series Tungsten Spark Gap