My 883A VTTC is based on Steve Ward's schematic. His schematic indicates a 5K ohm grid leak resistor. With that value I was getting a 19" spark at 140 volts on the variac. Today I experimented with the grid leak resistor by cutting it in half to 2500 ohms. My spark length increased by about 1" to 20 ". I didn't want to go any smaller yet. Is there a value of grid leak resistor that is too small for this design?
Steve
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