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Your 4 connections to the speaker are the two circled field coil connections, and the two output side connections (to the right of the two circled plate connections). In other words, the upper two red circles in your schematic are on the input side of the transformer and are not connected to the speaker coil. Your output transformer should have five connections - the two plates (red circled) and the center tap (yellow circled) - none of which should go to the speaker plug, plus the two output side connections (not circled) that do go to the speaker plug.
sorry I can't make a drawing right now, hope you get what I'm saying.
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