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Hello all, I am pleased to report my spark gap TC is working successfully with a new secondary coil. I was able to achieve 14" arcs to a rod connected directly to the bottom of the secondary, without any tuning. This was using a 4"x18" toroid topload; I have not yet tested with the 1"x12" toroid topload I also created. I also discovered I hadn't put sufficient space between some of the component leads of my Terry filter, and it began arcing over; a small problem to solve. Thanks again for everyone's assistance. Short video clip: https://www.youtube.com/shorts/heB2ssnwV-o Joshua Thomas -- Joshua Thomas My new email address is: joshuafthomas@xxxxxxxxx Please update your information if you have not already done so.