Re: Toroid Recommendations?

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Barton B. Anderson by way of Terry Fritz <twftesla-at-qwest-dot-net>" <tesla123-at-pacbell-dot-net>

Hi ALL,

I know everyone is busy with one thread or another, but could some of you
reply to Marks request for
toroid recommendations (see below for coil specs). I asked Mark to ask the
List so he could get an idea of
what sizes some of you are using, but haven't seen any replys come through yet.

Thanks,
Bart

Tesla list wrote:

> Original poster: "Mark W. Stolz by way of Terry Fritz
<twftesla-at-qwest-dot-net>" <mark_w_stolz-at-hotmail-dot-com>
>
> Hi All!
>
> I'm working on my new coil and wanted to get some input regarding the
> toroid.  Here's the specs:
>
> Primary
> 19 turn 20 degree inverse cone
> 3/8" tubing, 3/8" turn to turn spacing.
>
> Seconday
> 9" diameter 38" winding length 22 AWG single build
>
> Tank
> 15/60 NST, 7 segment RQ/TCBOR fan cooled static gap, 20 nF MMC
>
> I was think about using my existing 4" x 15.5" toroid from my previous coil,
> except that ETesla 6 indicates a drop in the free space capacitance from
> 17.2 pF to 5.2 pF.  I'm now thinking more towards a 4" x 30".
>
> What are your recommendations for minor/major diameters and why (i.e.
> testing, taste, experience)?
>
> Thanks in advance,
>
> Mark Stolz
> Houston, TX
>