From: Michael Tucknott [SMTP:Michael.Tucknott-at-virgin-dot-net]
Sent: Monday, May 04, 1998 12:34 AM
To: Tesla List
Subject: Re: Primary Help
Tesla List wrote:
> From: Michael Andrus [SMTP:andrus-at-ccountry-dot-net]
> Sent: Monday, June 01, 1998 10:13 PM
> To: Tesla List
> Subject: Primary Help
> I have a secondary that is 4" PVC and the coil is 18.5 inches long. It is
> wound with 21 guage wire, enameled.
> The tank circuit is a 15Kv 30ma NST with a .0049 Mf bottle capacitor.
> It uses a RQ gap with 4 gaps.
> My terminal is a torus 4"X14"
> What type of primary would work with this? I haave tried the following,
> 1) 12 guage house wire 12 turns vert. 8 in. diameter, 8" sparks
> 2) 1/4" copper tube flat spiral 7 turns from 5" to 16", no output
> 3) 11 guage enameled flat spiral 24 turns 5" to 16", no output
> I need a lot of help in this area, Please help. M. Andrus
You sound like you are having the same problem I was having sometime
With the advice I recived from the list I chose a primary made from
1/4"(8mm) copper tube this is wound into a saucer shape at an angle of
The pipe is spaced 1/4" apart and there are 12 turns.
The first turn is 1" away from the secondary and is the same height at
turn of the secondary.
Our coil tunes at 4 or 5 turns on the primary depending on the top load.
If you check out Gary Weavers web site at
you will find a file called best-pri.zip well worth a read.
Hope this helps
Cheers Mike Tucknott in the UK