[Audiodoctor]

Thanks everyone for your replies. I'm measuring the Red and White wires that go under the frame, and are attached to a coil that is attached to the cone- sure looks like a voice coil to me. The red lead is connected to the secondary of the output transformer, and the white lead goes to a very low resistance coil between the field coil and the frame. The other lead of this coil goes to the other lead of the output transformer secondary.
Ron, I'll check the link you referred to.