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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?
Regards
James Janota