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The LP (from long playing [2] 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 ...
Grooves on a modern 33 rpm record Uncommon Columbia 7-inch vinyl 33 + 1 ⁄ 3 rpm microgroove ZLP from 1948. CBS Laboratories had long been at work for Columbia Records to develop a phonograph record that would hold at least 20 minutes per side. [55] [56] Research began in 1939, was suspended during World War II, and then resumed in 1945. [57]
33 + 1 ⁄ 3 RPM may refer to: The playing speed, in rotations per minute, of LP records; The playing speed of some extended play records This page was last edited ...
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 . [ 2 ]
The introduction of both the 33 1 ⁄ 3 rpm, 12-inch LP record and the 45rpm, 7-inch record, coming into the market in 1948/1949, provided advances in both storage and quality. These records featured vinyl (polyvinyl chloride or polystyrene), replacing the previous shellac materials.
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 ...
Larger size Victor blanks were introduced late in 1931, when RCA-Victor introduced the Radiola-Electrola RE-57. These machines were capable of recording at 33 1 ⁄ 3 rpm as well as 78 rpm. One could select to record something from the radio or one could record using the hand-held microphone.
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