560 watts gives 42" sparks

• To: tesla-at-pupman-dot-com
• Subject: 560 watts gives 42" sparks
• From: FutureT-at-aol-dot-com (by way of Terry Fritz <twf-at-verinet-dot-com>)
• Date: Thu, 22 Apr 1999 16:09:34 -0600
• Approved: twf-at-verinet-dot-com

All,

I removed the 12kV, 30ma NST which gave 42" sparks at 620 watts,
and installed the (2) series'd 7200 volt, 1500VA PT's instead.  Using 
these PT's I now get 42" sparks at 560 watts (624VA).  Not a big
improvement, but it's my best results so far.  I'm using the .0147uF
LTR cap from the last NST set-up.  I'm only turning up the variac to
give 81volts to each PT, instead of the normal 120volts.  For some
reason I'm having less trouble with multiple break-outs even with the
small 4" by 17" corregated toroid.  The spark is nice and snappy.

In any case, the results suggest a 10% difference in overall 
efficiency between the NST and the PT/ballast arrangements.

Note:  In my NST experiments of a week or so ago, I didn't keep
the coupling constant as I switched from the reso-cap to the LTR
caps, so that may have had some slight effect on overall efficiency.
The coupling would of course be tighter with larger cap due to fewer
tapped turns in use in the primary. Just trying to give all the details 
here   :)  Of course tighter coupling sometimes makes sparks
shorter rather than longer depending on other factors.

John Freau

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