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I'll bet the reason the choke is on the speaker is that at the time, they were transitioning from field coil speakers to PM. The chassis were set up for field coil speakers where the coil served the second purpose of power supply filter component. By doing it this way they didn't have to modify the chassis and could use either field coil or PM speaker whatever was available.
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Reece
Perfection is hard to reach with a screwdriver.
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