Sony PS-X55S (1980-1981)

The PS-X55S weighs 8kg. That's not heavy by vintage standards, but it sits solid on the shelf.

Overview

The Sony PS-X55S is a full-auto player system from 1980. It rode the early 1980s push for hands-free convenience. Sony built it for people who wanted a direct-drive turntable that could take a record from drop to return with no intervention. It was priced at ¥52,000 in Japan, or $300 in the U.S. according to a 1981 New York Times article. That put it in the mid-tier component market, up against other fully automatic decks. Owners report it delivered on simplicity and reliability, though without the flamboyance of high-end contemporaries.

The PS-X55S is an evolution of the PS-X55. The S-shaped tonearm is gone, replaced by a low-mass straight arm made of a special aluminum alloy. Sony explicitly aimed the change at better sound, with less resonance and more rigidity. It is the most visible difference between the two models. A built-in microcomputer runs the whole system, which was notable for the time. It handles record size detection, auto-start, end-of-record return, and repeat playback. There is no manual cueing. You press play and walk away.

Under the skin, the engineering is careful. The 31 cm aluminum die-cast platter spins on a Linear BSL motor, a brushless, slotless design that minimizes torque fluctuation and gives smooth, quiet rotation. A quartz-controlled phase detection system holds the speed, using a magnedisk for signal reference. Velocity deviation is just 0.0003%, and wow and flutter is 0.02% wrms. Those numbers rival far more expensive decks. The signal-to-noise ratio is 78dB (DIN-B), and the load characteristic is 0% under 100g needle pressure, which points to very stable tracking force.

It starts up fast, within half a rotation at 33 1/3 rpm. End-of-record detection is contactless, which is more reliable than a mechanical trip system. The cabinet uses SBMC, an acoustic-grade material chosen for its resistance to resonance. Internal structural reinforcements and gel-like damping material in the insulators isolate the turntable further from outside vibration. The dust cover is thick and strong, designed to dampen airborne resonance. It was sold separately, a common cost-cutting move at the time.

The PS-X55S shipped with the MM-type XL-20G cartridge, which has a 0.6 mil diamond needle and a frequency response of 10 Hz to 30 kHz. Output is 3 mV at 1 kHz (5 cm/s, 45°), and the exchangeable stylus is the ND-200G. The head shell (SH-151) weighs 5.0g, and the cartridge itself 3.5g. The tonearm takes cartridges from 7.5g to 11.5g including the shell, or up to 15.0g with the included auxiliary weight. That covers many moving magnet options of the era. Effective tonearm length is 216.5mm, total length is 300mm, and needle pressure is adjustable from 0 to 2.5g.

Despite the automation, the PS-X55S doesn't feel like a toy. It measures 430 mm wide, 375 mm deep, and 135 mm tall, which is compact by 1980s standards, and the 8kg mass gives it a planted feel. The Synchro Remote Control Unit RM-65 was an add-on for ¥3,000 and allowed remote operation of playback functions, a luxury in its day. Included accessories are a 45 rpm adapter, auxiliary weight, head shell, and cartridge.

Specifications

Manufacturer	Sony
Type	Quartz Lock D. D. Full Auto Player System
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)
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
Usable cartridge weight limit (including shell) with auxiliary weight	11.0g ~ 15.0g
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
External dimensions	Width 430 x Height 135 x 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)

Key Features

Linear BSL Motor with Brushless, Slotless Design

The PS-X55S uses a Linear BSL motor. It is a direct-drive system with no brushes and no slots, which reduces torque unevenness and mechanical noise. The design runs efficiently and gives both strong starting torque and consistent rotation. With no physical contact points in the motor, it should last well. That matters in a full-auto deck that makes repeated start-stop cycles.

Quartz Lock Speed Control with Magnedisk Detection

Speed accuracy comes from a quartz lock system. It compares the rotational signal from a magnedisk to a crystal-stable reference. This phase-locked loop holds deviation to just 0.0003%, so pitch is very stable. The magnedisk method avoids optical or mechanical wear, which helps long-term reliability. Add the low wow and flutter (0.02% wrms), and the deck avoids the speed wobble common in budget direct-drive turntables of the era.

Low-Mass Straight Tonearm with Aluminum Alloy Construction

The PS-X55S replaces the S-shaped arm of the PS-X55 with a straight tonearm made of a special aluminum alloy, built for high rigidity and low mass. Effective length is 216.5mm and total length is 300mm. It is engineered to minimize resonance and tracking error. The arm supports cartridges weighing 7.5g to 11.5g, or up to 15.0g with the auxiliary weight, so upgrades are possible. Needle pressure is adjustable from 0 to 2.5g, and the included SH-151 head shell weighs 5.0g.

SBMC Cabinet with Integrated Damping

The cabinet is made of SBMC, an acoustic material selected for low resonance compared to standard plastics or metals. Structural reinforcements and strategic thickness variations suppress partial resonance. Gel-like damping material is enclosed within the insulators to absorb outside vibration. This layered isolation helps keep the signal clean, especially in less-than-ideal environments. The chassis feels inert, with no ringing and no buzz.

Microcomputer-Controlled Full Automation

A built-in microcomputer handles all the automated functions: record size detection, automatic cueing, end-of-record return, and repeat playback. The end-of-record sensor is contactless, so there are no mechanical levers to wear or misfire. Users select 33 or 45 rpm from the front panel, and the auto size selector confirms the record diameter before playback. Movements are smooth, not jerky. The Synchro Remote Control Unit RM-65 allows remote operation, a rare feature at this price point.

Historical Context

The PS-X55S arrived in 1980 as part of Sony's push into the mid-tier component market with fully automatic turntables. It was based on the PS-X55 but had a straight tonearm and refined automation. A 1981 New York Times article described it as one of the “excellent and fully automatic turntables of a more conventional sort” in the mid-priced category. That suggests it was seen as a reliable, no-nonsense option among a wave of automated decks. In Sony's lineup it sat alongside more exotic models like the PS-X75 Biotracer.

Collectibility & Value

Current market examples show the PS-X55S listed around $300 in near-mint condition. Units that do not power on or lack the dust cover, which was sold separately, tend to sell for less. Service manuals are available, which helps with restoration. A known issue among surviving units is capacitor degradation, particularly in the power supply and control circuits, so servicing calls for recapping. The microcomputer-controlled automation is complex, and repairs can be hard without proper documentation.

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