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You wrote:

> My secondary is built on a 6.0" dia pvc pipe - probably 6.25" od.  It is
> covered with 5 - 6 coats of polyurethane.  The wire is #22 formvar covered
> magnet wire - then covered with another 6 coats of polyurethane.  I believe
> the winding length is 27"  (my records are at home and I'm at work).  There
> is approximate 960 turns.  Primary is 15 turns of 3/8" copper tubing wound on
> a plastic coil form at 30 degrees (saucer shaped).  Toroid is 40" in dia and
> 5 or 6" thick.  Spark gaps are one rotary with a static gap in series.  I
> haven't checked the frequency since I built my newest toroid.  With my 33"
> toroid, I believe the frequency was about 130 khz.

I assume that that toroid (40"x5-6") is optimised for your system (having 
followed your previous postings). Is the dimension simply related to the coil
dimensions or is there a more complex relationship involving operating power
and frequency etc?

Phil Mason