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I am waiting for a O.T. to arrive, at which point I will apply all the suggestions. And I'll post what I find. Thanks to all.

I want to thank you all for your responses. I'm well aware that with the turns ratio being correct, one side of the primary will measure resistively different to the other side relative to the center tap due to simple physical dimensions i.e. the "inner coil" will have lower resistance than the "out...

Has anyone encountered a case where unequal turns in the primary winding of the output transformer made the bias applied to the output tubes unequal and, when driven, caused too much current to be drawn in one tube? This of course assumes that all other components, screen grid resistors, grid resist...