SONY PS-X40

Commentary

A full auto player developed by inheriting the technology of the high-grade machine.

In order to eliminate uneven torque, it is equipped with a simple linear BSL (slotless) motor that does not require a brush or slot. Since slots that cause cogging are eliminated, uneven torque is minimized and smooth and quiet rotation is realized.
In addition, high torque is obtained due to high efficiency, and reliability and durability are also improved.

The velocity detection section of the servo system adopts a Magne-disk velocity detection method developed by introducing precision measurement technology of Sony Magne-scale.
In this method, a magnetic material is coated on the inner wall of the outer periphery of the turntable, which has a wide rotating area, and 512 wave detection signals are magnetized. The average value of these signals is detected by a multi-gap head, and control commands are sent to the servo system.
In addition, since the generated signal has a high frequency of approximately 284 Hz at 33 1/3rpm, servo compensation can be performed up to relatively high frequencies of flutter components.

Magnedisk A crystal lock is adopted by adding a phase control circuit of crystal oscillation to the detected speed servo circuit. By phase locking the detected signal, not only initial drift due to self-heat generation of the body, but also rotational speed deviation due to voltage fluctuation due to self-heat generation and rotational speed decrease due to needle pressure load are reduced, and excellent rotational characteristics are obtained.

The arm pipe section is made of a special aluminum alloy with greatly increased rigidity. By adopting a J-shape with high bending strength, rigidity approximately 8 times that of conventional aluminum pipes is obtained.
In addition, by adopting an integrated structure from the neck cylinder section to the bearing section, unnecessary joints are eliminated and resonance factors caused by joint looseness are eliminated.

The bearings use a Longs pan bearing shaft supported by a single straight shaft to prevent play caused by ball bearings. This minimizes movement at the operating point.
In addition, a tapered mirror finish of hardened cemented carbide with a diameter of 5 mm is used for the pivot shaft to improve contact with precision radial bearings and provide high rigidity support.

The SBMC is used for the cabinet because internal loss is larger than metal and the structure with high precision and strength can be easily obtained.

It uses a large insulator filled with gel-like high-viscoelastic material in a rubber cup.
The material filled in this insulator is very flexible, has high internal losses, and has moderate spring elasticity, which enables effective vibration absorption.
In addition, the height of this insulator can be adjusted to keep the cabinet horizontal, and the center of gravity is lowered to further improve stability.

Equipped with a full auto mechanism to improve safety, even if the tone arm is forced to stop by hand during lead-in or return, the auto mechanism will be disconnected instantly and no burden will be placed on the mechanism.
Other features include an electronic memory circuit that responds faithfully to continuous operation instructions, quick lead-in and auto-cut operations, and a front control that can be operated even when the dust cover is closed.

MM type cartridge XL-15 is attached to the cartridge.

Model Rating

Type	Crystal Lock D. D. Full Auto Player System
<Turntable portion>
Turntable	31.4 cm Aluminum Die Cast 1.6 kg (Including Rubber Sheet)
Wow and flutter	0.025%wrms
Load characteristic	0% (Needle Pressure 100g)
Start-up characteristic	Within 1/2 Rotation (at 33 1/3rpm)
Drift time	0.0003% / h or less
Signal-to-noise ratio	73dB(DIN-B)
Tone Arm Section
Effective length	216.5mm
Total Length	300mm
Needle pressure adjustment range	0 ~ 3g (0.1g Interval)
Shell dead weight	10.5g(SH-145)
Usable cartridge weight limit (including shell weight)	12g ~ 19g 18g ~ 24.5g (Auxiliary Weight Used)
Cartridge Section
Cartridge	MM Type (XL-15)
Frequency characteristic	10 Hz to 30 kHz
Output voltage	4 mv (1 khz, 5cm/s, 45 °)
Needle	0.6 mil diamond needle
Dead weight	5.2g
<General>
External dimensions	Width 445x Height 145x Depth 400 mm
Weight	Approx. 8 kg
Attachment	45 Rotation Adapter Auxiliary weight Head Shell (SH-145) Cartridge (XL-15)