Ampex Corporation introduced the model 300 multi-channel magnetic tape recorder in 1949. Early users of these machines concentrated primarily on the development of stereophonic recording techniques, but it was soon apparent that multi-channel recorders were opening the way to a wide variety of other applications. During 1957, Ampex began to market half-inch three channel model 300 recorders ^[1] using high crosstalk rejection, cast-construction head assemblies.

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