SANSUI SR-929 Turntable Dust Cover Record player Japan

A high-end turntable system employing a quartz servo system and a knife-edge/one-point tonearm.

The turntable uses a direct-drive system, and the servo circuit employs a quartz servo system.

The quartz servo system controls the motor using two systems: a PLL servo system including a crystal oscillator circuit and a phase comparison circuit, and an FG (frequency generator) servo system. The drive motor's rotation speed is determined based on the crystal oscillator frequency, and any delay or advance in the turntable's rotation speed is detected by the FG and controlled by the PLL circuit. Furthermore, the detected signal is converted to a DC voltage by a frequency-to-voltage conversion circuit and compared with the reference voltage to control the servo circuit.

These two servo systems achieve the precise rotation speed crucial for a turntable system. The SR-929 employs the then-latest C-MOS IC in the PLL section and two high-integration ICs in the FG servo section to achieve high reliability.

When the quartz servo is turned OFF, only the FG servo system operates independently. This allows for pitch adjustment of the record, with adjustments possible within a range of ±3..5%

Manufacturer : SANSUI

Model : SR-929

Drive system: Electronically controlled direct drive

Motor: Brushless DC servo motor

Rotation speed: 33-1/3, 45 rpm

Turntable: 302mm diameter die-cast aluminum alloy

Wow and flutter: 0.028% or less (WRMS)

Effective arm length: 240 mm

Overhang: 15.6mm

Rated power consumption: 7W or less

External dimensions: W490 x H173 x D381 mm

Weight : 17.1 kg