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In a message dated 10/8/00 11:46:20 AM Pacific Daylight Time,
> Original poster: "James" <mustang3-at-home-dot-com>
> Hi there coilers,
> Ok, here's my problem. My VTTC tesla with two 833a's works well. The HV
> xmfr for my VTTC has a MOT with the shunts knocked out, running a 1/2 wave
> voltage doubler(level shifter). Outputs about 4000 volts with 60 cycle
> ripple. I bought a large xmfr with 6800 CT secondary. Using 2 uwave
> rectifiers I grt 3500 volts or full-wave. This is 120 cycle ripple. The
> sparks are much shorter (but sound much higher in frequency; 60/second vs
> 120/second). Now here it is. Why when I have so much more power with the
> full-wave set up do I get a shorter spark. I have run the coil on 1/2 of
> secondary winding on AC and the sparks are much longer. To me, this is
> strange. I would think that more power would give longer sparks. The MOT
> xmfr gives 18 in. sparks, big xmfr gives 13 in. on AC, 10 in. on full-wave.
> The full-wave is very flame like, very hot. Questions, answers?
I suppose that when you use full-wave, the spark behaviour is
becoming a little more like filtered DC in a sense (spark is more
constant and higher pulse rate). This again shows the benefits
of low "break-rates" not only for disruptive TC's but for tube coils.
The spark appearance you describe is beginning to sound like
DC tube coil sparks.... so I guess it's tending in that direction
..... in a way.