DUAL CS 731Q (1981) | Ultra Low Mass

 

The breakthrough for audible improvement - ULM tonearm, Quartz/PLL direct drive. Most controls of the CS 731Q are located on the front panel. This allows all turntable functions to be controlled vibration-free with the cover closed. On the CS 731 Q, the pitch adjustment can be read on an opto-electronic analog display. A + or - in the display unit indicates whether the actual speed is leading or lagging behind the nominal speed. Quartz-controlled direct drive. This accuracy is generated by a high-precision quartz with an oscillation frequency of 4.608 MHz. The target values ​​for 33 rpm and 45 rpm are derived from this frequency through electronic division. A 200-pole frequency generator coupled to the motor supplies a proportional frequency for each motor speed, the actual value. This actual value is compared in a PLL circuit with the target value supplied by the quartz and synchronized in phase. The Dual tonearm is another special feature of the 731Q. This is hidden behind the abbreviation U.L.M. and can be considered a minor sensation: U.L.M. stands for "Ultra-Low Mass." Its developers have made the arm considerably lighter. Together with the Ortofon ULM 60E system developed exclusively for Dual, it has a fantastically small effective mass of just eight grams.

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