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Why not substitute a PM speaker, and an 85 ohm power resistor for the field coil, for the time being. Then you can install the correct speaker when one comes along. The output transformer is not very critical, it'll either be about a 5000 ohm primary impedance if the TV has a power transformer, or a 2500ish primary impedance if it doesn't. Can grab one out of any junk tube tv, and epoxy it to the frame of the speaker.
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