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The pin drive speakers were used where the field coils of electrodynamic speakers were impractical due to power requirements, as in some farm sets of the thirties, where battery power needed to be conserved. This type of speaker was abandoned once good Alnico magnet PM speakers came along in the early forties. Interestingly, at least one transistor radio, I believe a G.E., used a pin drive speaker due to space requirements, in the early sixties.
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Reece
Perfection is hard to reach with a screwdriver.
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