This paper describes both a philosophy and a number of techniques for evaluating magnetic tape recorders. For purposes of evaluation, a tape recorder may be considered as three units: the tape transport mechanism, the magnetic heads, and the electronic circuits. The tape transport must be tested for its ability to carry the tape past the heads at a uniform velocity, as well as for its auxiliary functions of fast-forward and rewind. The recording and playback heads must be evaluated for output, bandwidth, and uniformity of response. Finally, the electronic circuitry must be evaluated for low noise, low distortion, and proper equalization. An over-all test may then be made to complete the evaluation. Figures are included which illustrate the various techniques recommended for evaluating magnetic tape recorders.
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