Audio Database

Image of the MU-31D
Commentary

Belt drive phono motor with hysteresis synchronous outer rotor motor.

Uses a 4-pole hysteresis synchronous outer rotor type motor with large torque and enhanced durability.
An aluminum alloy die-cast turntable is used for the turntable.

A Center shaft side pressure prevention mechanism is adopted. A pulley is placed in the opposite direction of the capstan, and a belt is also placed on it to prevent side pressure to the shaft. This is a unique mechanism.

Equipped with a button lock function, it has a safety design so that the rotation speed cannot be changed when the motor stops.
This prevents the belt from hurting.

Model Rating
Type Phono motor
Motor 4-pole hysteresis synchronous outer rotor type
Drive system Belt drive
Turntable 30 cm Diameter Aluminum Alloy Die-cast (1.3 kg)
Number of revolutions 33 1/3, 45 rpm
Uneven rotation 0.1% or less (WRMS)
S/N 50 dB or more
Attachment mechanism Push-button speed selector
Center shaft side pressure relief mechanism
Belt protection device
External dimensions Width 335x Height 109x Depth 325 mm
Weight 3.9kg