The combined weight of the rotating parts is about 1-3/4 pounds. Evidently the eddy currents induced in the disc by the currents through the drive coils create a magnetic field that reacts with the stationary field to turn the platter (a thin, flat aluminum disc that rests on the rotor disc). The two fixed drive coils are located opposite each other with their pole pieces close to the inside and outside surfaces of the rim of the disc. The driven section (or rotor) of the turntable is a stamped metal disc that measures about 7-3/4 inches in diameter and has a rim about 1 inch wide. motor,” which appears to be an eddy-cur-rent drive system similar to that used in an electric-utility watt-hour meter to rotate a disc that operates its counters. It uses what B&O calls a “magnetic-drive servo-controlled d.c. The turntable, unlike the belt-driven types used in the 4000 Series! is a quartz-locked direct-drive type whose drive system is totally unlike any of the other direct-drive turntables on the market. The cartridge supplied with the Model 8000 is the top-ranking B&O MMC 20CL, which has a sapphire cantilever and a line-contact diamond stylus that tracks at a 1-gram force. One carries a light source and detector to sense the presence or absence of a record on the turntable, and the other carries the cartridge. The arm looks like two parallel arms on a single sliding carriage. The B&O 8000 features the same type of low-mass, tangential-tracking, servo-driven tone arm used in all previous 4000 Series units. However, although it shares some basic design concepts with the 4000 Series, the Model 8000 is a completely new product. The Beogram 8000, currently the top-of-the-line Bang & Olufsen record player, is a direct descendant of the 4000 Series record players produced by B&O for a number of years.
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