Sony ps-3750 (1978-1980)
Direct drive turntable with brushless DC motor, Magne-disk servo, and statically balanced tonearm
Overview
The Sony PS-3750 is a direct drive record player system manufactured by Sony, featuring a brush and slotless DC motor with precision speed control via the Magne-disk servo system. It supports 33 1/3 and 45 rpm playback with pitch control adjustable by ±4%, achieving wow and flutter of less than 0.03% WRMS. The turntable includes a statically balanced universal tonearm with plug-in headshell, designed for MM cartridges like the included XL-15, and comes with alignment tools, a 45 rpm adapter, and a removable hinged acrylic dust cover.
Specifications
| Turntable Diameter | 31.4 cm |
| Platter | 314 mm (12-3/8 inches) aluminum alloy diecast |
| Motor Type | DC brushless motor (Brush and Slotless / BSL) |
| Servo System | Magnedisk servo |
| Drive System | Direct drive |
| Speeds | 33-1/3 and 45 rpm |
| Pitch Control | ±4% |
| Wow and Flutter | less than 0.03% WRMS |
| Signal-to-Noise Ratio | better than 70 dB (DIN-B) |
| Tonearm Type | Statically balanced, universal |
| Tonearm Effective Length | 216.5 mm (8-1/2 inches) |
| Overall Arm Length | 300 mm (11-7/8 inches) |
| Overhang | 16.5 mm (21/32 inches) |
| Tracking Error | within +3°, -1° |
| Tracking Force Adjustment Range | 0–3 g |
| Cartridge Weight Range | 4–13 g (without extra weight) |
| Cartridge | MM Type Cartridge XL-15 |
| Cartridge Frequency Response | 10 Hz to 30 kHz |
| Cartridge Output Voltage | 4 mV (1 kHz, 5 cm/s) |
| Cartridge Load Impedance | 50k Ω ~ 100k Ω |
| Cartridge Compliance | 15×10⁻⁶ cm/dyne |
| Optimum Needle Pressure | 1.7 g (range: 1.2–2.5 g) |
| Needle Type | 0.6 mil diamond |
| Power Requirements | 120 V, 60 Hz |
| Power Consumption | 7 W |
| Dimensions (W × H × D) | 445 × 155 × 365 mm (17-5/8" × 6-1/8" × 14-3/8") |
| Weight (net) | 9 kg (19 lb 13 oz) |
| Supplied Accessories | Alignment protractor, 45 rpm adaptor, cartridge spacer and screws, extra weight |
Design
The PS-3750 uses a brush-and-slotless (BSL) DC servo-controlled motor with a concentric circular solid core and trapezoidal wave magnetized magnet ring to minimize cogging torque. Speed detection is achieved via a Magne-disk servo system using a barium ferrite-coated platter with 512 magnetized signals and an 8-tooth double-gap head, generating ~284 Hz at 33 1/3 rpm. The cabinet is made from SBMC, an acoustic material with high internal loss and low resonance, integrally molded with reinforcement to reduce vibration. The tonearm features a precision pivot bearing with damper support at each joint, remote viscous-damped cueing, and a rotatable armrest for easy balancing. The platter has a resonance-reducing undercoating and air-damped record mat, while the headshell is aluminum alloy with internal lateral balancing. A built-in stroboscope with prism illumination and rim markings allows speed verification, and the system uses a low-capacitance phono cable with separate ground wire.
Market
As of January 6, 2026, a unit was listed for €175 on Marktplaats. Auctions on Yahoo Japan from 2020–2026 show bids ranging from ¥1,000 to ¥3,000. Some listings sell units for parts or junk, with unverified operation including motor, power, and pitch control functions. Compatible aftermarket accessories include the AT91R and AT3600L cartridges with Litz-wired headshells designed for plug-and-play use.
eBay Listings
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