Original poster: "Paul Marshall" <klugmann-at-hotmail-dot-com> I am looking for a coil form 12" or greater diameter. The length should be about 4 times the diameter. Also I am planning on using a 40kV .5uF capacitor for the tank circuit. I have a 25kVA pig to drive it. Has anyone on the list ever used that much capacitance in their tank circuit ? Paul S. Marshall