Pancake Primary (fwd)

• To: "'Tesla List'" <tesla-at-pupman-dot-com>
• Subject: Pancake Primary (fwd)
• From: Tesla List <tesla-at-stic-dot-net>
• Date: Thu, 19 Feb 1998 23:25:30 -0600
• Approved: tesla-at-stic-dot-net

----------
From:  SBJohnston-at-aol-dot-com [SMTP:SBJohnston-at-aol-dot-com]
Sent:  Thursday, February 19, 1998 2:44 PM
To:  tesla-at-pupman-dot-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-at-aol-dot-com

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