Doug,
I unintentionally ran a similar test, although I cannot recall what the
exact uF was, but as Bert pointed out, my NST's couldn't charge the caps,
and therefore the spark gap did not fire — even when closing down to a very
small gap. Occasionally I would get an odd orange colored pop, but not the
brilliant blue snap. I would suggest sticking with the 10nF.
~Dan
Kansas City area
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