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Beogram 8000 is and was Bang & Olufsen`s top turntable, design concept similar to the 4000 series but is brand new product.
The Beogram 8000 has a servo-driven tangential tone arm. The arm looks like two parallel arms. One has a light source and a detector to detect the presence or absence of a disc on the turntable, and the other carries the Picupen / needle top rated B&O MMC 20CL.
B&O 8000, Has a quartz-controlled direct-drive system that no other players on the market have. It uses what B&O calls a "magnetically powered servo-controlled DC motor".
The driven section (or rotor) of the turntable is a punched metal disk that measures approximately 7-3 / 4 inches in diameter and has a rim of about 1 inch wide. The two fixed drive coils are located opposite each other with their pole pieces near the inside and outside of the edge of the disc. An eddy current is created through the drive coils a magnetic field that drives the plate (a thin, flat aluminum disk resting on the rotor disk). Unlike regular direct-drive multi-pole motors, which have a pulsating torque characteristic, the B&O engine seems to deliver a constant torque in all positions to the turntable.
An optical speed wheel under the rotor interrupts a beam of light and delivers pulses to the servo system at a frequency proportional to the speed of the turntable. The microcomputer that controls all functions on the B&O 8000 compares these pulses with a reference frequency derived from a quartz crystal oscillator, and a corrective signal is applied to the drive coils to lock the speed of the turntable to the desired value.
The B&O 8000 is fully controlled by push buttons on a control panel at the front of the player. When a disc has been placed on the turntable, pressing the play button will turn on the turntable.
The actual speed is displayed with a four-digit reading on the control panel (normally at 33.33 rpm). By pressing small "" or "-" buttons under the screen, the speed changes in steps of 0.05 rpm over a range of about ± 3 percent (at 45 rpm, the steps are 0.07 rpm).