Original poster: "Gerry Reynolds" <gerryreynolds-at-earthlink-dot-net> Hi all, If one sets the toroid height too high above the secondary, the top turn of the secondary is not shielded properly and breakout can occur from the top turn. QUESTION: What is the motivation for raising the toroid above the top turn. Why doesn't one put the tororid at the position of the top turn??? Gerry R Ft Collins, CO