Phil Allison wrote:

"Bob"

IIRC, impedance is turns ratio squared. That would mean that he should
tie the "4 ohm" tap to ground instead of the 8 ohm tap. I would
presume that he wanted the same voltage levels (but 180 degree out of
phase) on both cathodes).


** Correct - the posted ( hypothetical) diagram is wrong on that.

Indeed, the grounded CT of the 16 ohm whole speaker winding should be for
4ohms
from either end, and the 8 ohm connection should be between the shown 4&16
points.

Don't expect diagrams posted on the web to contain correct information
which has all the operating voltages and information relevant.

Patrick Turner.



http://www.nashaudio.com/Public/6550_OUT.pdf

......... Phil