Original poster: "resonance" <resonance@xxxxxxxxxxxx>
The best route for an experimenter than can live with 7.5 to 8 ft
long sparks is our dual MOT design. Matching dual MOTs can be
obtained direct from AMPI.com for $100 each and the SISG boards are
inexpensively available from Mark Dunn. I give away the dual MOT
plans on off-list request. It's a great coil, highly portable, easy
to set up, and most important --- I did the design so it would
operate from two separate 120 VAC circuits, each circuit driving a
single MOT at 16-18 Amps. 220 VAC not required for 7.5 to 8 ft long sparks.