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I think there is a pin in the cassette area that gets pressed down when a tape is inserted; maybe two of them (the second one determines if the record-protect tab was removed). The captions/PCM switch was used with an external digital-audio recording adapter, and apparently affected closed-caption recording as well.
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Chris
Quote from another forum: "(Antique TV collecting) always seemed to me to be a fringe hobby that only weirdos did."
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