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Re: [TCML] SGTC conversion question.



On 6/11/18 2:09 PM, David Speck wrote:
James,

A coil that is suitable for single ended drive "could" be used in a bipolar arrangement.  The old Cenco bipolar coils were built this way.

However, I think that you would be better off with a secondary with a gap in the center where the windings are in the "shadow" of the primary.

Secondary windings that fall within the windings of a typical cylindrical primary would not add any useful voltage to the output of the coil.

If you used a flat pancake primary, this effect would be minimized, but I can't ever recall seeing a bipolar coil with this sort of primary arrangement.

Dave


On 6/11/2018 1:50 PM, James Janota wrote:
I had an idea. After I get successful at my coil building, how hard would it be to change it to a bipolar TC?



Or, if this one works, wind a second secondary of the same size. Either way, you'll have plenty of work to figure out to support the secondary(ies) and primaries, etc.

I can see taking the existing secondary, putting a second topload on it on the other end, then mounting it horizontally.

A pancake primary in the middle - if you have enough clearance.

Tuning and mechanical support will be "interesting" - one thing is that it's harder to control the coupling - with a conventional flat primary and secondary above it, you can raise and lower the secondary to decrease/increase the coupling.



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