Model 556 microphone

FAQ #2755 Updated February 22, 2018


I have a Unidyne, as it is spelled on the tag, model number, 556, dynamic microphone. It looks to be fairly old, and is not working at the present time. The serial number on it is; E2019.


It could be as old as 1942, or as young as 1963. The serial number does not identify the year.

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