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Audio Recording Tapes Based on Iron Particles

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Tapes based on acicular metal particles can be made which, under conditions typical for audio cassette recording, give an outstanding performance when compared to chromium dioxide (CrO/2): an increased signal-to-noise ratio (about 3 dB) combined with a better high-frequency maximum output level (up to 9 dB). Although these tapes have a high coercivity (about 75 kA/m), these results can be obtained with a bias level setting which is only about 3 dB higher in comparison to Cr0/2. They can be used with the same playback equalization.

JAES Volume 26 Issue 11 pp. 838-842; November 1978
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AES - Audio Engineering Society