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Hi All,Does anyone know of a general rule-of-thumb for how large to wind a primary for a bi-polar coil? For example, I'll be building two coils, each with 4-inch secondaries. I was thinking somewhere around 10 inches in diameter.Thoughts?Thanks,Dan K. _______________________________________________ Tesla mailing list Tesla@xxxxxxxxxxxxxxxxxx https://www.pupman.com/mailman/listinfo/tesla