Secondary winding jig

Using a coil winder and varnished and sanded mailing tube I built a 600 turn secondary.  0.5mm wire was used.

Achieved 34cm arcs with about 1300 watts.

Vacuum Tube Tesla Coil Schematic VTTC

Above is a schematic for an easily tuned vacuum tube tesla coil. To build the tickler/feedback add a few more turns to the base of the secondary and ground the point they join. The base of the secondary now connects to the grids.

Below is a video of the setup and operation. Power is about 650W.

Update: I achieved 30cm arcs at 1200W with this unit. Arcing to ground will cause serious over voltage on the primary be sure to add a spark gap. Also added a toroid with 10 turns of 5kv wire between the tank circuit and hv out from doubler for emi filtering.

Unusual discharges from a ring topload on VTTC

Base Fed or HF VTTC

Schematic for a VTTC which runs at 8mHz