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Thorens Turntable
TD-160-II/SME 3009-III
The THORENS belt-drive. The THORENS-motor drives the turntable platter by means of a rubber belt. The natural elasticity of the belt prevents most motor vibrations from reaching the platter and, therefore, the pick-up stylus. For many years of continuous development, THORENS has reduced the very few disadvantages of belt drive to an absolute minimum and has brought it to a level of technical perfection which is not approached by any other system.
The THORENS drive motor. The TD-160 MkII is driven by a 16 pole two-phase synchronous motor. This motor has two identical stators which work on the rotor at an angle of precisely 90°, thus creating a perfectly circular rotating field and resulting in optimum wow and flutter and rumble figures. This construction also assists in reducing the magnetic stray flux to a minimum, thus preventing any disturbing hum induction on very sensitive pick-up cartridges. As is the case of any synchronous motor, the speed of rotation is determined by the power frequency and by the number of poles used and, therefore, this will always remain constant regardless of aging, dirt or climatic conditions. At a mains frequency of 50 Hz the motor rotates at a speed of only 375 rpm, with a speed of 450 rpm at 60 Hz, and because of this low speed, both the motor rumble figure and bearing wear are reduced to the absolute minimum. The motor is controlled by the mains frequency, thus achieving a speed constant which may be compared with the precision of an electric clock.
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