The Turn Of The Century Electrotherapy Museum http://www.electrotherapymuseum.com Radio Inductance-Induction Coil Powered By Tesla Coil Circuit, Powering A Tesla Coil The circuit is essentially a Tesla Coil Powered Tesla Coil Schematic Micrometer Spark Gap is set to .001" or less.  Spark Gap 2 is set from .030 - .060".