Reproducer test tapes (also called alignment tapes or standard tapes) are used to standardize the asimuth, frequency-response characteristics, and recorded levels of magnetic sound recording systems. Informal working standards and formal standards are discussed, with emphasis on changes in standards and possible resulting confusion. The manufacturer of reproducer test tapes is described, including special requirements for heads and blank tape, and the methods for determining the asimuth and the flux vs. frequency response characteristic. Handling techniques which minimize the chance of damage are also described.
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