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If you get into that particular one, this is what I found and would be curious what you find.


The one I mailed was a two-part ferrite.  A ferrite sleeve that goes over the coil and the slug inside it.  The coil form had five divisions for windings, lets call the one closest to the pins winding slot 1 and slot 5 being at the top.    The outer winding was the center tapped one going from an outside leg, 2 turns in slot 2, 3 turns in slot 3, brought back to the center pin, then 3 turns in slot 4 and 2 turns in slot 5, finishing at the third pin.  The untapped winding is the inside winding with 3 turns in slot 1, and 2 turns in the remaining 4 slots for a total of 11 turns.