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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.
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.
The following is an attempt to list some of the most valuable records. Data is sourced from Record Collector , eBay , Popsike, the Jerry Osborne Record Price Guides, and other sources. Wu-Tang Clan 's Once Upon a Time in Shaolin CD (of which only one copy was produced) was sold through Paddle8 on November 24, 2015, for $2,000,000, according to ...
The most common rotational speeds for gramophone records became 33 + 1 ⁄ 3 revolutions per minute (rpm), and 45 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]
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.
Filmophone flexible record A red Filmophone record Mechanical analog; lateral groove, horizontal stylus movement - made from cellulose of various colours - 78rpm Durium Record or Hit of the Week Records: A brown Durium 78rpm record Mechanical analog; lateral groove - made from paper coated in a brown resin 1930s Reel-to-reel, magnetic tape
Carlos Martín Ballester (born 1974): 75,000 78 rpm records (carlosmb archive) plus 5,000 78 rpms records and 200 cylinders (private collection). [27] It is the largest collection of 78 rpm records pressed in Spain. Part of the archive is on sale and new items are added regularly. [28] Elton John (born 1947): 70,000 items. [29]
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