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For a machine that cost $500, this was a relatively novel idea. [3] Regina shipped 100,000 music boxes between 1892 and 1921, with sales topping out over $2 million a year. The company had 325 employees, and even as Symphonion established an American branch, Regina thrived as the market leader.
In a direct-drive turntable the motor is located directly under the center of the platter and is connected to the platter directly. It is a significant advancement over older belt-drive turntables for turntablism, since they have a slower start-up time and torque, and are prone to wear-and-tear and breakage, [5] as the belt would break from backspinning or scratching. [6]
The direct metal mastering (DMM) process uses a copper-coated rather than lacquer-coated disc. Before lacquer discs, master recordings were cut into blank wax discs. Once complete, this master disc is used to produce matrices from which the record is pressed. For all intents and purposes, the finished record is a facsimile of this master disc. [1]
Vinyl LP preservation is generally considered separate from conservation, which refers to the repair and stabilization of individual discs. Commonly practiced in major sound archives and research libraries that house large collections of audio recordings, it is also frequently followed by audiophiles and home record collectors.
The rotating disc was 750 mm in diameter and operated at 250 rpm, hence at a circumferential velocity of about 10 m/sec. The grinding knives were made of bronze. With a power of 22-27 kW, the mill grinds 5-8 tons per day. с. fibers. A more advanced grinding apparatus is the Bertram disc mill.
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