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Re: Primary tubing size

Original poster: "Bart B. Anderson" <bartb@xxxxxxxxxxxxxxxx>

Hi Mike,

I use 3/8" tubing for my primary on my 8.5" coil. Works great and no arc overs. The inner turn is ideally nearest at the beginning of the winding. I typically set that distance to 1.25" as measured from the center of the tubing to the secondary edge for a typical 15kVrms cap voltage.

Take care,
Bart

Tesla list wrote:

Original poster: "Mike Knowlton" <amdx@xxxxxxxxxxx>

I'm planning the primary for my 8-1/2" x 40" secondary.

I think I'll make the primary a sloped pancake @ 25*,
Any better suggestions?

I'm considering 3/8" over 1/4" copper tubing.
Any good reason to use the larger diameter?
Turn spacing provided by 10-32 nylon screws.

Also how for should I start the inner turn from the
O.D of the secondary?

        Thanks for the feedback

                   Step by step
                                Mike