Original poster: "tesla by way of Terry Fritz <twftesla-at-qwest-dot-net>" <tesla-at-cyberverse-dot-com> I am collecting parts for a future Tesla coil project. I bought a NST that I've never seen mentioned before, and am wondering what the list thinks of it. it is a: Allanson 15kv-at-60ma The spec I'm not sure about is this: The secondary is "midtap grounded." What does that mean? Regards, Gene lambert