Sony PS P7X (1978)
A direct-drive auto return turntable from Sony’s Precise series, introduced in 1978 with precision speed control and a compact, user-friendly design.
Overview
The Sony PS P7X is a direct-drive turntable developed as part of Sony's micro component PRECISE lineup. Introduced in October 1978, it features an auto-return mechanism, electronic record-end detection via luminous sensor, and front-panel controls for tonearm movement, motor start/stop, and speed selection. Designed for accuracy and ease of use, it includes a linear BSL (slotless) motor with crystal lock speed control and a Magne-disk velocity detection system. The turntable was noted for its ergonomic design and solid performance across musical genres, offering a secure and authoritative playback experience.
Specifications
| Dimensions | 430x110x350 mm |
| Weight | 9.5kg |
| Turntable | 32 cm Aluminum Die Cast |
| Wow and flutter | 0.025%wrms |
| Signal-to-noise ratio | 75dB(DIN-B) |
| Tone Arm Effective length | 216.5mm |
| Tone Arm Total Length | 300mm |
| Needle pressure adjustment range | 0 ~ 3g |
| Usable cartridge weight limit (including shell weight) | 12g ~ 18.5g |
| Usable cartridge weight limit (Auxiliary Weight Used) | 18g ~ 24.5g |
| Cartridge | MM Type (XL-25A) |
| Cartridge Frequency characteristic | 10 Hz to 30 kHz |
| Cartridge Output voltage | 4 mv (1 khz, 5cm/s, 45 °) |
| Cartridge Needle | 0.3x0.8 mil Oval Diamond Needle |
| Cartridge Dead weight | 5.2g |
| Motor type | linear BSL (slotless) motor |
| Speed control | crystal lock |
| Auto-return mechanism | equipped with a servo motor with FG for arm drive |
| Record-end detection | electronic record-end detection Luminous sensor |
| Display | LED display of rotational speed is possible |
| Speeds | 33 1/3 & 45rpm |
| Startup time | 1/2 rotation (33 1/3rpm) |
| Moment of inertia | 230 kg /cm2 |
| Tonearm balance | static |
| Overhang | 16.5 mm |
| Anti-skating | 0...g / off (dial around tonearm base) |
| Output cable capacitance | 100pF / m |
Design
The PS P7X uses an SBMC cabinet for reduced resonance and features a low center of gravity insulator with adjustable-height feet filled with a gel-like high-viscoelastic material. The tonearm employs a long-span pivot design and includes a diecast aluminum headshell and diecast zinc alloy armbase. Speed stability is ensured by the Magne-disk velocity detection method, while a muting mechanism prevents needle-tip touch noise during startup. Front-panel feather-touch controls manage arm movement, motor operation, and speed selection.
Context
The Sony PS P7X was developed as part of the Precise P7 system, positioned within Sony’s micro component PRECISE lineup. It shared its BSL motor technology with the PS-X60 and was praised for its compact size, ease of use, and ergonomic design compared to larger contemporaries. The model was discontinued around 1982, coinciding with the launch of the Compact Disc in Japan.
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