>Original Poster: "Dr. Resonance" <Dr.Resonance-at-next-wave-dot-net> > >Chris: > >Flat spiral is best for most coils -- helps prevent overcoupling which can >damage caps & NST's > >Dr.Resonance I know that overcoupling can damage one's secondary due to the arcing, but how does that damage one's caps and NST? Gary Lau Waltham, MA USA