I have done several 100s of these tests, There is no way we can put 40,000 volts across those tubes, maybe if you run 2 wires and plug them to the HV lines out on the street.
The problem is that the more voltage you put into your WFC the more it will conduct.
Now about that paragraph: "voltage is switched off... bla.. bla.. bla....."
This is the description of DC resonance circuit, but It does not really work the way Stan describes.
When the pulse is off, yes the choke's magnetic field collapes, but it is very fast, and when the pulse is turned back on, the energy from the choke is gone.
so you never get the double pulse that Stan Blabs about.
the real DC resonance circuit works like this:
http://www.richieburnett.co.uk/dcreschg.htmlthere the power supplied to the choke is constant, and the pulses are created by discharging the capacitor that was charged by the choke.
I have tested this with a real cap and it does work.