RE: [TCML] Topload design questions

["Lau, Gary" <Gary.Lau@xxxxxx>]

Hi Karl,

Using two toroids as you describe is a common and good idea.  By raising the upper toroid, I think it reduces the tendency to have racing sparks as well as primary strikes.  I like to use a large metal can to separate the two toroids, but I think the choice of technique results in purely mechanical & aesthetic differences.

I use a single15/60 NST with a 6" secondary, topped with lower 4.5" x 15.5" and upper 7" x 30" toroids.  So you may want to consider a larger topload after things get optimized.

Regards, Gary Lau
MA, USA

> -----Original Message-----
> From: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] On
> Behalf Of Karl Thorkildsen
> Sent: Friday, January 02, 2009 12:35 PM
> To: tesla@xxxxxxxxxx
> Subject: [TCML] Topload design questions
>
> First off, Hello!  I've been lurking for a while and have gained a
> huge amount of knowledge by reading hundreds of posts here.  I have
> built a couple of coils and am working on a third.  This will be run
> off two 15/60 NST's.
>
> My question is about topload configurations.  I understand the need
> to have a toroid in close proximity to the top of the secondary to
> avoid corona discharge from the upper part of the primary.  But if
> using two toroids, can the upper (and larger) toroid be elevated a
> few inches on a conductive rod without adverse side effects?
>
> For instance in my case I'm considering a 6.5x30 inch secondary, with
> a 3x12 and a 4x18 toroid and raising the 4x18 by 6 inches.
>
> Why, you might ask?  Well, I originally thought of this as a way to
> reduce primary strikes, but I now realize this might only be valid
> under certain conditions.  Another consideration is that it would
> look cool.  But in the end I'm now just curious what the effect and
> ramifications might be.
>
> Thoughts?
> - Karl

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