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Pancake Primary (fwd)
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To: "'Tesla List'" <tesla@pupman.com>
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Subject: Pancake Primary (fwd)
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From: Tesla List <tesla@stic.net>
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Date: Thu, 19 Feb 1998 23:25:30 -0600
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Approved: tesla@stic.net
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From: SBJohnston@aol.com [SMTP:SBJohnston@aol.com]
Sent: Thursday, February 19, 1998 2:44 PM
To: tesla@pupman.com
Subject: Re: Pancake Primary (fwd)
Jim Buck wrote:
>I then ran the coil at low power and unwound the helix turn
>by turn until the corona stopped.
Do you mean you "loosened" the upper/outer turns, increasing their diameter
and thus reduced the number of turns?
>When I found the shape I
>built my forms 1" larger diameter at the same angle. I'm
>not sure how well the corona compares to the magnetic
>coupling but the coils seem to be coupled efficiently
>(raising the secondaries doesn't increase the output much).
I haven't seen corona on the primary, but so far I haven't excited the coil
with that much energy, I guess. Or maybe flat spiral primaries are more
prone to corona?
Thanks for the tips!
Steve Johnston
sbjohnston@aol.com