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Arc'ing in my variac



Original poster: Pat Masterson <bat-at-grumman-dot-com> 

I was tuning my small coil (15/30 NST) and noticed little sparks dancing
around the windings of my variac. Is there something fundamentally wrong
with the setup, or do I need an RFI filter between the variac and the
NST? The variac is an older model, and has no 3rd wire (ground) on its
AC line.  -pat