[TCML] Capacitive Discharge Pulse Mode with my VTTC

[Roger Smith <rwsmith@xxxxxxxxxxxxxx>]

    The holy grail for many people who build tube coils is to get those 
nice sword like sparks and there are several people on this mailing  
list who have found some creative ways of getting them by pulsing the 
plate voltage in just the right way to get the best spark growth .   I 
have recently been experimenting with a rather low tech way of doing it 
with my 3cx10000a3 tube coil.     I use a SCR in the cathode circuit to 
start the pulse like you would do running in staccato mode and I charge 
up a big capacitor capacitor in the plate circuit  and I have a big iron 
core choke between the capacitor and the plate of the tube.  When the 
capacitor is charged the SCR is triggered and the capacitor discharges 
though the choke and drives the tube coil for some fraction of a second.

      Currently my capacitance is 7uf and the choke is 6 Henrys and I'm 
charging the capacitor to about 20,000 volts.   The sparks I'm getting 
are much more sword like than what I get in other modes and they are up 
to 50" long  ( longer than what I get running staccato mode).      Here 
is a link to a video .... http://www.youtube.com/watch?v=KxIEz_Q_hmo

Also,  here is a link to a time exposure of the coil running in pulse 
mode... http://www.flickr.com/photos/29248051@N02/6104333777/in/photostream

Roger

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