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The LP (from "long playing" [1] or "long play") is an analog sound storage medium, specifically a phonograph record format characterized by: a speed of 33 + 1 ⁄ 3 rpm; a 12- or 10-inch (30- or 25-cm) diameter; use of the "microgroove" groove specification; and a vinyl (a copolymer of vinyl chloride acetate) composition disk.
The most common rotational speeds for gramophone records are 33 + 1 ⁄ 3 revolutions per minute (rpm), 45 rpm, and 78 rpm. Established as the only common rotational speed prior to the 1940s, the 78 became increasingly less common throughout the 1950s and into more modern decades as the 33 and the 45 became established as the new standards for ...
Columbia pressed many 7-inch 33 + 1 ⁄ 3 rpm vinyl singles in 1949, but they were dropped in early 1950 due to the popularity of the RCA Victor 45. [ 83 ] [ full citation needed ] Original hole diameters were 0.286″ ±0.001″ for 33 + 1 ⁄ 3 and 78.26 rpm records, and 1.504″ ±0.002″ for 45 rpm records.
The label usually noted whether the disc was "outside start" or "inside start". If there was no such notation, an outside start was assumed. Beginning in the mid-1950s, some transcription discs started employing the "microgroove" groove dimensions used by the 12- and 10-inch 33 + 1 ⁄ 3 rpm vinyl LP records introduced for home use in 1948 ...
When the Columbia LP was released in June 1948, the developers subsequently published technical information about the 33 1 ⁄ 3 rpm, microgroove, long-playing record. [5] Columbia disclosed a recording characteristic showing that it was like the NAB curve in the treble, but had more bass boost or pre-emphasis below about 150 Hz.
33⅓. This article is about the book series. For other uses, see 33⅓ (disambiguation). Cover of the Live at the Apollo book. 33+1⁄3 (Thirty-Three and a Third) is a series of books, each about a single music album. [ 1 ] The series title refers to the rotation speed of a vinyl LP, 33+1⁄3 RPM.