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Old 01-08-2012, 07:35 PM
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Join Date: Jul 2004
Location: Rancho Sahuarita
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"Its ID plate says MI-40206-A, but the ETF website says it's a model TM-10, so that's what I'll call it."

RCA professional gear often had a type number (TM-10 in this case) and always an MI number that appeared in the catalog book/price sheet for ordering. Even the crossover networks used for the public address/music speakers at the 1964-65 New York World's Fair were specified by MI-number, which allowed me to track them down to determine the circuit used.
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