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From the 1950s through to the 1980s, the 12" LP record and the 45 rpm record became the major formats for the distribution of popular music. The LP format remains in use for occasional new releases, though other formats have largely supplanted it. The size of the typical cardboard LP sleeve cover is 12.375 in (31.43 cm) square.
A twelve-inch Capitol Records gramophone record. The twelve-inch single (often written as 12-inch or 12″) is a type of vinyl (polyvinyl chloride or PVC) gramophone record that has wider groove spacing and shorter playing time with a "single" or a few related sound tracks on each surface, compared to LPs (long play) which have several songs on each side.
Sizes of records in the United States and the UK are generally measured in inches, e.g. 7-inch records, which are generally 45 rpm records. LPs were 10-inch records at first, but soon the 12-inch size became by far the most common. Generally, 78s were 10-inch, but 12-inch and 7-inch and even smaller were made—the so-called "little wonders". [82]
The most common diameter sizes for gramophone records are 12-inch, 10-inch, and 7-inch (300 mm, 250 mm, and 180 mm). [1] Early American shellac records were all 7-inch until 1901, when 10-inch records were introduced. 12-inch records joined them in 1903. [2] By 1910, other sizes were retired and nearly all discs were either 10-inch or 12-inch ...
In some regions (e.g. US), the default hole size fitted the original RCA 1.5-inch (3.8 cm) hub which, due to a format war, was incompatible with the 0.25-inch (6.4 mm) spindle of a Columbia-system 33 1/3 RPM 12-inch LP player. In other regions (e.g. UK, Australia), the default was a small hole compatible with a multi-speed 0.25-inch spindle ...
LP record. 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⁄ 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.
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