On Fri, 30 Aug 1996, Tesla List wrote: > but > now with the added output, I am getting interturn sparking on the > secondary...I figured this was due to not properly being tuned so I began > attempting to tune the tap on the primary...no matter where I go I cannot > seem to eliminate this problem. You might try raising your secondary up a little to reduce the coupling. Over-coupled systems are prone to inter-turn breakdown. Steve Roys