Dual 811A Vacuum Tube Tesla Coil

VTTC spitting out 3" sword sparks in its original configuration.

VTTC spitting out 3″ sword sparks in its original configuration.

This was my first major electronics project! After putzing around for a few months in 8th grade with a flyback transformer-powered spark gap coil, I decided that I wanted to take a step up and build something a little more interesting, so I selected one of Steve Ward’s early VTTC schematics and got to work. The performance of first version of the coil (pictured above) was somewhat underwhelming, but it worked! Later improvements more than doubled the spark length.

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