[TCML] Toroid size

[bartb]

Hi Jim,

I'm thinking 6" x 30" would be about right. This gives a decent smaller 
diameter but not too big. The 30" outer size is due to the coil size.

You are apparently running a resonant cap size with the transformer. Why?

Take care,
Bart

Jim Calvin wrote:
> I have just finished a building a medium sized tesla coil.  It uses 9KVA @
> 120ma.  It has an 8" x 33" secondary and uses a dual tungsten spark gap with
> a fan.  It has a primary tank capacitance of .0346uF made from an MMC cap.
>
>  
>
> I tried running it with my 30 inch toroid that I use on my big coil (7.8KVA,
> 7 feet tall).  I know this toroid is too big for this coil but it is the
> only one I had available, besides my 12 inch toroid which I believe is too
> small.  With no breakout point I got nothing.  When I put a breakout point I
> got about 2 foot arcs.  Now I expect to get about double that with the right
> size toroid.  So my question is: what is the proper size toroid for a coil
> of this size and power? (18 inch, 20 inch . etc). 
>
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