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Staccato Controller Problems



Original poster: "Chris Fanjoy" <zappyman@xxxxxxxxxxx>

This is about my dual 813 VTTC again. I posted earlier that I managed to get it going, with mixed results. The main problem right now is the staccato controller. If I try to draw a spark of more than about 1/4", or if I hold a fluorescent bulb more than 1/4-1/2" away from it, it goes from pulsed mode to continuous wave. The SC circuit is the one with a zero-crossing enhancement, and it doesn't seem to make much difference which phase is used for the crossing. I tried reversing the leads to the grid winding, this reduced the output voltage a bit but allowed slightly longer sparks to be drawn before going into CW.
Any ideas as to what could cause this problem??