"Am I correct in assuming that converting to a DC supply solves the problem of resonance rise blowing out your neon xfmrs and the RF feedback into the supply line? jim heagy" ALMOST correct. It is certainly true if you use large enough filter capacitors, but the wrong values (at least in the voltage-doubler I analyzed) can lead to significant resonant rise. Certainly the RF feedback would not get by the filter capacitor. Ed