I have been doing some testing with the power resistors that allow the use of GF NST's with TC's,[ 6k/30ma ones anyway]. I have not yet been able to obtain a 12k or 15k to try with a coil. Perhaps the GEEK GROUP will be kind enough to lend me one? I have also had good luck using a pair of P-R with a MARX I built that liked to trash the power supply's I use for it. No more failed power supplies! Here is a link to some info on the power resistors. https://www.globalspec.com/learnmore/electrical_electronic_components/passive_electronic_components/power_resistors Doug _______________________________________________ Tesla mailing list Tesla@xxxxxxxxxxxxxxxxxx https://www.pupman.com/mailman/listinfo/tesla