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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.
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 ...
Three vinyl records of different formats, from left to right: a 12 inch LP, a 10 inch LP, a 7 inch single. A phonograph record (also known as a gramophone record, especially in British English), a vinyl record (for later varieties only), or simply a record or vinyl is an analog sound storage medium in the form of a flat disc with an inscribed, modulated spiral groove.
Here are some examples of recent online sales on eBay. But many also include additional shipping costs of $10 to $25 depending on where they are coming from. John Coltrane: Cosmic Music, $25 ...
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.
In 1960, RCA Victor announced the Compact 33 double extended play and singles; these were 7 inch records, which played at 33 1/3 rpm. In January 1961, the Compact 33 discs were released simultaneously with their 45 rpm counterparts. The long-term goal was to phase out the 45 rpm disc, but sales of the new records were poor and by early 1962 the ...
RIAA equalization is a specification for the recording and playback of phonograph records, established by the Recording Industry Association of America (RIAA). The purposes of the equalization are to permit greater recording times (by decreasing the mean width of each groove), to improve sound quality, and to reduce the groove damage that would ...
However, some very early (c. 1928–1931) radio programs were on sets of 12-inch or even 10-inch (25 cm) 78 rpm discs, and some later (circa 1960–1990) syndicated radio programs were distributed on 12-inch 33 + 1 ⁄ 3 rpm microgroove vinyl discs visually indistinguishable from ordinary records except by their label information.