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European shellac records – In the first three decades of the twentieth century European companies including Pathé, Odeon, and Fonotipia made recordings in a variety of sizes, including 21 cm. [citation needed] 9 in (23 cm) Early American shellac records – Prior to 1910, nine-inch brown shellac records were issued under the Zon-O-Phone label.
The grooves are engraved into the master disc on a mastering lathe.Early versions of these master discs were soft wax, and later a harder lacquer was used.. The mastering process was originally something of an art as the operator had to manually allow for the changes in sound which affected how wide the space for the groove needed to be on each rotation.
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A master recording was cut into a blank wax or acetate disc. [a] This was electroplated to produce a metal stamper from which a number of identical discs were pressed in shellac or vinyl in a record press. Although the earliest transcription discs were pressed in shellac, in the mid-1930s quieter vinyl compounds were substituted. These discs ...
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The lateral-cut NAB curve was remarkably similar to the NBC Orthacoustic curve, which evolved from practices within the National Broadcasting Company since the mid-1930s. Empirically, and not by any formula, the bass end of the audio spectrum below 100 Hz could be boosted somewhat to override system hum and turntable rumble noises.
No matter what fragrance family you prefer — gourmand, fruity, woody, fresh, and so on — the best holiday candles will make your home feel more festive this winter and set the scene for all ...
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