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A Long-Life Sapphire Stylus for Discrete Quadraphonic Discs

Microhardness and wear resistance of surface-hardened synthetic sapphire crystals have been measured and compared with conventional sapphire crystals. To evaluate the utility of processed sapphire crystals for playback styli for discrete four-channel disc systems, wear tests have been conducted in relation to the quality of the reproduced sound.

JAES Volume 22 Issue 7 pp. 521-523; September 1974
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