Re: Toroid = shorted turn ?

• To: tesla-at-pupman-dot-com
• Subject: Re: Toroid = shorted turn ?
• From: ntesla-at-ntesla.csd.sc.edu (by way of Terry Fritz <terryf-at-verinet-dot-com>)
• Date: Fri, 09 Oct 1998 16:14:03 -0600
• Approved: terryf-at-verinet-dot-com

>Yes, Wild Bill Emery and I had a problem with a small toroid on the bottom
>of an 
>"extra" coil which over-heated.  The toroid had no center aluminum disk, and 
>formed an excellent shorted turn.  We removed the toroid and found that
>output 
>spark length increased about 10%.  It is very likely that if the toroid had
>had a 
>solid conductive disk in the center it would not have been so troublesome,
>but we 
>found we didn't need it for corona suppression after all.  I've never
>noticed a top 
>toroid having a heat problem, but our top loads have always had a center
disk.

Right. It *looks* like a turn, but if there's a conductive center disk,
it's *electrically* just a lump of metal as far as the coil's concerned.
(Electostatic field-shaping effects notwithstanding :)

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