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Re: [TCML] Burnt Joint (Cap Bank)

Hi Carl,
I was always under the impression that "fat" secondaries were desirable due to their increased inductance density. It's my understanding for optimal performance the coupling K must be kept within an optimal range (.1 to .13 or so, I believe) and that over coupling will often result in those dreaded racing sparks over the surface of the secondary coil. The double-ended coil sounds pretty neat, BTW.

From: Carl Noggle <cn@xxxxx>
To: Tesla Coil Mailing List <tesla@xxxxxxxxxx> 
Sent: Monday, May 13, 2013 12:21 AM
Subject: Re: [TCML] Burnt Joint (Cap Bank)


We built a double-ended coil in high school, from an old book which has now been lost.  It was a most excellent book, not too big, tan colored hardcover.  It had much useful information, and one of these pieces of wisdom was that you should make your secondaries fat, like Mark says.  Our secondary ws 4 ft long x 11" dia.  It worked quite well, especially for having no end loads.  My current coil (pun not intended, but not removed either) is single ended, 30" high x 12" dia.  It works fine.

Does anybody know the book of which I speak, maybe even knows where a copy may be obtained?

I presume that the fat secondaries work better because of the better coupling.  Does this sound right?

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