[Arran]

The Philco 96 uses Push pull #45s, the model 20s use push pull #71As. What is most important is the ratio between the primary and the secondary, this is why most of those universal replacement type output transformers have only three wires on the primary side, but six taps on the secondary side. I am kind of puzzled by the chart showing the ratio for a transformer for push pull 71A's, 45's, or 50's, it has a note stating that the center tap is not used, you cannot have a push pull pull audio circuit with those tubes without using a center tapped primary on the output transformer.
Regards
Arran