RE: [TCML] Toroid question

["Jim Mora" <wavetuner@xxxxxxxxx>]

Hi Gary and Andrew,

I have a 4"x16' aluminum taped toroid on a modified France 12/30 (shunts/2)
4" coil and am convinced it is too small. I am going to try a wrapped 4*22"
and save the other one as a corona ring. The 4" has a classic keeper John 6"
corona ring under it. This is as big I want to run in the single garage
space for winter. It was built as a demo coil where my 8" was too big.

Jim Mora

-----Original Message-----
From: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] On Behalf
Of Lau, Gary
Sent: Friday, May 29, 2009 6:13 AM
To: Tesla Coil Mailing List
Subject: RE: [TCML] Toroid question

Hi Andrew,

As you noted, bigger toroid equals bigger streamers but fewer of them.

Personally, between the two choices you gave, I would choose the larger
4.5x18 toroid.  I haven't personally built a coil powered by a 12/30 so I
can't say how much larger than that one could go.  Do you already own both
of those toroids?  If so, try stacking both of them and see how that
performs, assuming that you have sufficient primary turns to accommodate the
lower frequency.

The final answer will depend upon how much time and cash you have available.
Big spun toroids are expensive.  If cash is limited, you may want to try the
custom-made foam toroid that I had made -
http://www.laushaus.com/tesla/foamtoroid.htm 

Regards, Gary Lau
MA, USA

> -----Original Message-----
> From: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] On
> Behalf Of Andrew Robinson
> Sent: Friday, May 29, 2009 3:23 AM
> To: tesla@xxxxxxxxxx
> Subject: [TCML] Toroid question
> 
> I asked this once before but dont remember getting a very clear answer.
> 
> With a 4" x aprox 22" secondary. 12/30 NST what would be an appropriate
> sized toroid? I've heard bigger toroid equals bigger streamers but fewer
> of them. I guess looking at it from the physics point of view, bigger
> toroid = more capacitance = bigger streamer but longer charge times.
> 
> Basically we're looking at either a 3" x 12" spun toroid or a 4.5" x 18"
> spun toroid. Also is there a better place to get these other than ebay.
> Can someone out there sell us one?
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