Original poster: "tesla by way of Terry Fritz <twftesla-at-qwest-dot-net>" <tesla-at-paradise-dot-net.nz> Hi Greg Can you advise: a) what thickness of wire your using in Sec b) No turns c) Sec dia d) Sec form material That red hot winding must mean one Heck (beat you Terry) of a lot of secondary current. Tnx Ted L inNZ