Original poster: "Dr. Resonance by way of Terry Fritz <teslalist-at-qwest-dot-net>" <resonance-at-jvlnet-dot-com> It doesn't go into depth on NST's but does cover non-saturable current reactance type transformers --- very similar in design. Dr. Resonance Resonance Research Corporation E11870 Shadylane Rd. Baraboo WI 53913