SONY PS-X30A
¥ 39,800 (around 1979)
Commentary
A record player system equipped with a full-auto mechanism while pursuing basic performance.
It is equipped with a simple linear BSL (slotless) motor that does not require a brush or slot in order to eliminate torque unevenness, which can be said to be the destiny of a DC motor. By eliminating the slot that causes cogging, torque unevenness 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.
The arm pipe is made of a special aluminum alloy with greatly increased rigidity. By adopting a J-shape with high bending strength, the arm pipe has approximately eight times the rigidity of conventional aluminum pipes. 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, which has higher internal loss than metals and can easily obtain high-precision, high-strength structures. In addition, the large-size insulator, which is filled with gel-like high-viscoelastic material with adjustable height in a rubber cup, reduces vibration.
It is equipped with the same full auto mechanism as that of the PS-X40.
Equipped with functions such as an arm limiter mechanism to protect the tone arm and mechanism, electronic memory to respond to continuous operation instructions, quick action, front control, etc.
Uses MM type cartridge XL-15.
Model Rating
| Type | D. D. full auto-player system |
| <Turntable portion> | |
| Turntable | 31.3 cm Aluminum Die Cast 1.2 kg (Including Rubber Sheet) |
| Wow and flutter | 0.03%wrms |
| Start-up characteristic | Within 1/2 Rotation (at 33 1/3rpm) |
| Signal-to-noise ratio | 70dB(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. 7 kg |
| Attachment | 45 Rotation Adapter Auxiliary weight Head Shell (SH-145) Cartridge (XL-15) |