Tedd: Don't see any reason why such a system won't work, independent of power. I tried something similar a while back, direct coupling the bottom of a small (3"OD x 15" long coil, wound with #30 wire) directly to the same coil I used as a primary, and by tapping it correctly across the coil got essentially the same results. Power was very low (12 volt battery powered auto spark coil), but got 4 inch sparks. Ed Phillips