RE: Primary

["Lau, Gary" <Gary.Lau-at-compaq-dot-com> (by way of Terry Fritz <twftesla-at-uswest-dot-net>)]

Hi Dan:

I have a 6" system, and I have something less than 1 inch of horizontal
clearance from the pri to sec.  I also use a 15 degree conical primary, but
this was left over from when I used a 4" secondary and wasn't able to lower
the secondary enough to get sufficient coupling.  With the 6" coil, I think
you will get fine coupling with a flat primary, as long as your design
allows the secondary to be lowered sufficiently.  There's nothing wrong with
the conical type, except that it just reduces the clearance between the top
load and primary.

Regards, Gary Lau
Waltham, MA USA

>Original poster: "Dan Kunkel" <dankunkel-at-hotmail-dot-com> 
>
>Coilers,
>
>I am designing my second coil.  I am using a 6.625" x 26.5" secondary and 
>15,000v 120 ma worth of NST's. I am going to use 1/4" copper tubing for the

>primary (probably 15 degrees or so incline). I want to get a nice tightly 
>coupled system, I was planning on about 9.5" inside diameter for the 
>primary. I don't want to re-wind the same piece of copper 3 times in order 
>to peak the system. So I was hoping someone else who has a 6" coil could 
>tell me the inside diameter of their primary coil.
>
>Thanks in advance,
>
>Dan