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Bi-Radial and Spherical Stylus Performance in a Broadcast Disc Reproducer

A number of observations are reported on an improved disc reproducer consisting of a tone arm and cartridge assembled as a matched system. Interchangeable stylus assemblies with spherical or bi-radial tips were used with convenient test records. Since only the stylus assemblies were changed, the effects caused by changes in tip radii are readily seen. The data reveal several problems involving bi-radial and spherical stylus relationships for which a theoretical model is incomplete. There has been much concern recently over the effects of bi-radial styli such as extremely high stress imposed on the record groove and the possibility of shorter record life. Record wear data are shown for the bi-radial stylus which indicate that record life is about the same as with a spherical tip, when both are used in low inertia assemblies.

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