SONY PS-X55S
¥ 52,000 (released in 1980)
Commentary
This full-auto player system is based on the PS-X55 and equipped with a low mass and straight arm to improve sound quality.
The built-in microcomputer processes commands for selecting record sizes, read-in / return operations, repeat playback, and other operations. In addition, the arm's motor and electronic circuit provide smooth and safe auto operation.
In addition, it is equipped with an auto record size selector to automatically select the record size.
The end-of-record detection mechanism uses a contact-less system with enhanced reliability.
Linear BSL motor is used.
Because this motor does not require a brush or slot, torque unevenness is reduced, and quiet and smooth rotation is achieved. Moreover, high torque is obtained due to high efficiency, and reliability and durability are improved.
Magnedisk speed detection is used for the speed detection part of the servo circuit.
In this system, the multi-gap head detects the mean value of the detection signal, which is densely magnetized on the turntable, and captures minute changes in the rotational frequency. 33 Since the generated signal has a high frequency of approximately 284 Hz at 1/3rpm, servo compensation is possible up to relatively high frequencies of the flutter components.
The speed signal obtained by the magnet-disk speed detection is compared with the reference signal and controlled to maintain the correct rotational speed. However, the temperature characteristics of the element used in this case may affect accurate servo control. In order to improve this, we have adopted a quartz lock that controls the phase of the detected signal.
By taking advantage of the high oscillation precision of quartz crystal, stable rotational characteristics that are resistant to changes in ambient temperature, power supply voltage and frequency are obtained.
The tone arm uses a low-mass, straight arm made of a special aluminum alloy with increased rigidity, and realizes excellent followability corresponding to light needle pressure and high compliance of the cartridge.
In addition, XL-20G, a high-compliance type MM cartridge, is used.
The cabinet uses an acoustic material, SBMC, which is less likely to resonate than metals and has high precision and strength. Partial resonance is suppressed by considering the thickness and structure in a comprehensive manner and reinforcing the structure at important points.
In addition, a thick and strong dust cover has been adopted to improve vibration damping characteristics.
Gel-like dump material is enclosed in the insulator to realize effective vibration absorption.
In order to enjoy dubbing of records more easily, it is equipped with a synchronized play function with the deck by the separately sold remote control unit.
Model Rating
| Type | Quartz Lock D. D. Full Auto Player System |
| <Turntable portion> | |
| Turntable | 31 cm Aluminum Die Cast |
| Wow and flutter | 0.02% wrms (rotating system) |
| Load characteristic | 0% (Needle Pressure 100g) |
| Start-up characteristic | Within 1/2 Rotation (at 33 1/3rpm) |
| Velocity deviation | 0.0003% |
| Signal-to-noise ratio | 78dB(DIN-B) |
| Tone Arm Section | |
| Effective length | 216.5mm |
| Total Length | 300mm |
| Needle pressure adjustment range | 0 ~ 2.5g |
| Shell dead weight | 5.0g(SH-151) |
| Usable cartridge weight limit (including shell) |
7.5g ~ 11.5g 11.0g ~ 15.0g (Auxiliary Weight Used) |
| Cartridge Section | |
| Cartridge | MM Type (XL-20G) |
| Frequency characteristic | 10 Hz to 30 kHz |
| Output voltage | 3 mv (1 khz, 5cm/s, 45 °) |
| Needle | 0.6 mil diamond needle |
| Dead weight | 3.5g |
| Exchange needle | ND-200G(¥3,500) |
| <General> | |
| External dimensions | Width 430x Height 135x Depth 375 mm |
| Weight | 8kg |
| Attachment | 45 Rotation Adapter Auxiliary weight Head Shell (SH-151) Cartridge (XL-20G) Dust cover |
| Sold Separately | Synchro Remote Control Unit RM-65 (¥ 3,000) |