Tube DIY Asylum

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My mistake!

Posted by Paul Joppa on September 1, 2013 at 17:45:23:
Sorry all; I thought the 600 ohms was from one end of a winding to the centertap of that winding. I understand now, it's from one end to the far end.

As for the windings in series, I simplified by assuming class B operation, so when one side is conducting the other isn't doing anything. The power supply has essentially zero impedance at audio frequencies, so B+ is the same as ground - at audio frequencies. Then the signal current loop ia B+ to half the plate winding to the plate through the tube to the cathode to half the cathode winding to ground which is B+. So the two half-windings are in series.