[TCML] Choosing secondary coil form size

[David Rieben]

Hi Michael,

I think that you will find a 6" diameter secondary coil form
to be pretty optimal for a coil in the 1 to 3 kVA range. The
4" x 24" would still work but due to the increased secondary
inductance with a 6" diameter secondary coil form vs. a 4"
diameter form, you would likely get more "bang for your
buck" i.e. longer sparks, with the 6" form.

David Rieben


----- Original Message ----- 
From: "Michael Bellah" <michaelbellah at cox.net>
To: <Tesla at pupman.com>
Sent: Tuesday, March 04, 2008 12:36 PM
Subject: [TCML] Choosing secondary coil form size


Hello list,
              I have decided to build my first coil and have sourced a NST 
from a local sign shop. Its rated output at 115v is 9kva/120ma. I was 
planning on using a secondary coil form around 4x24, but I was also planning 
on a smaller transformer. I am wondering if I should go to perhaps 6 or even 
8 inch diameter due to the 120ma out of the transformer or is this a wash 
because it is only 9kva out? Thank you in advance for your help.

Michael Bellah
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