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Use any PM 6 or 8" speaker that you have. The two remaining wires from the transformer go to the two terminals on the speaker. Polarity does not matter in this case. The transformer is fine mounted where it is.
The transformer is used because the tube has a high output impedance. The transformer matches this to the low impedance of the speaker. Ideally your speaker should be rated 3.2 ohms (commonly referred to as 4 ohms) but an 8 ohm will also work, just giving slightly lower volume, but probably not noticeable. This is a pretty hefty radio, power transformer and all, and was surely worth restoring. Congrats!
Reece
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Reece
Perfection is hard to reach with a screwdriver.
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