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    Why do vinyl records spin at 33 1/3, 45, and 78 R.P.M.?

    Question #117100. Asked by star_gazer. (Aug 28 10 1:20 AM)


    serpa

    		In 1925, 78.26 rpm was chosen as the standard because of the introduction of the electrically powered synchronous turntable motor. This motor ran at 3600 rpm, such that a 46:1 gear ratio would produce 78.26 rpm.

    http://en.wikipedia.org/wiki/Gramophone_record

    See article for more info.

    For even more info: http://www.straightdope.com/columns/read/228/why-are-record-speeds-33-45-and-78-rpm

    Aug 28 10, 10:33 AM

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