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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.
After the 1940s, "vinyl" records made from polyvinyl chloride (PVC) became standard replacing the old 78s and remain so to this day; they have since been produced in various sizes and speeds, most commonly 7-inch discs played at 45 rpm (typically for singles, also called 45s ("forty-fives")), and 12-inch discs played at 33⅓ rpm (known as an ...
Underground hardcore punk bands in the 1990s started releasing EPs on all sizes of vinyl including 5 inches in size. [citation needed] Children's records were manufactured in this size from the early 1900s (Little Wonder Records) all the way up to the late 1950s (Spear, Lincoln, Little John, Robin Hood, Simon Says, etc.) [citation needed] 6 in ...
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.
16 2/3rpm vinyl record: A label close-up on a 16rpm vinyl Mechanical analog; lateral groove, horizontal stylus motion - played at half the regular speed of an LP 1951 Minifon P55 Minifon cassette Analog, magnetic wire on reel, 30 cm/s or about 11.8 ips was quickly adopted by many governments as being the ultimate "spy" recorder of its day 1957 ...
RCA Victor and Columbia were in a "market war" concerning which recorded format was going to win: the Columbia LP versus the RCA Victor 45 rpm disc (released in February 1949). Besides also being a battle of disc size and record speed, there was a technical difference in the recording characteristics.
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