• WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES.
    Building, troubleshooting and testing of these amplifiers should only be
    performed by someone who is thoroughly familiar with
    the safety precautions around high voltages.

Magnavox Amp 169 AA schematic

That I don't know. I did not do surgery on this transformer. To approximate, you can look at current ratings on the AWG magnet wire chart. The idle current of each primary half is about 30 mA, so look for wire diameter with at least 40 mA rating, and that will be it.