I’m currently working on getting demos together for upcoming conference so I thought I’d share a couple clips

Tesla brush bulb replica illuminating under RF:
https://www.bitchute.com/video/VvUFuPXK1nV8/
The brush bulb is a replica made by Griffin Brock, with a partial vacuum on the inner bulb and a deep vacuum on the outer bulb.

High voltage transformer action using one wire to a Tesla Extra coil.  No primary and no secondary:
https://www.bitchute.com/video/COwdkKgDxJ5b/
System is being powered with a high-power ham radio linear amplifier through a T-match tuner, fed from a primary oscillator.

You’ll notice the voltage produced is lower than a ‘modern’ Tesla/Oudin oscillator, but the current within is much higher.  That arc is a standing flame that instantly ignites wood/paper.

To reach extreme potentials such as those at Colorado Springs, an Extra coil would be fed from a loose-coupled resonant primary+secondary arrangement, somewhat reminiscent of a modern Tesla coil.

Since the system is matched near to 50 ohms, at peak power the input is only ~200vRMS (600v p/p).  So from the length of the spark we can conclude the magnification factor is likely 200 or greater.  Of course this could also be measured using lower power (function generator) input and a scope, or by using the standard ‘Q calculator’ using bandwidth sharpness and frequency.

I do plan on doing a proper 3-coil Colorado Springs replica eventually for the ‘big cool sparks’ demonstration but it probably won’t be until sometime post-conference.