The Reproducer Test Tape affords the most satisfactory field means of standardizing magnetic sound recording systems. This method is nevertheless susceptible to numerous errors of measurement due to: 1) inappropriate Test Tape (wrong speed, equalization, track format, or test frequencies), and 2) mechanical misadjustment of the reproducer (head height; azimuth and zenith adjustment; and poor tape-to-head contact due to -dirt- on heads, inadequate tape tension or wrap around the heads, improper vertex adjustment, worn heads, and improper tape guiding).
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