Pioneer PL-51A (1974)
A direct-drive turntable built for precision playback of stereo, quad, and CD-4 records with a dynamically balanced platter and low-noise motor.
Overview
The Pioneer PL-51A is a high-fidelity turntable manufactured in 1974, the Japanese-market name for the Pioneer PL-1200A. Designed for audiophiles and enthusiasts working with advanced formats like CD-4, Quad, and SQ records, it features a static-balance S-shaped tonearm optimized for lightweight cartridges such as the Shure V15. The turntable emphasizes stability and low distortion, with a dynamically balanced 31 cm aluminium alloy diecast platter and an ultra-slow running brushless DC servo motor. It includes pitch control with stroboscopic calibration accurate to ±2% and LSC (Low Stray Capacity) output cables to preserve high-frequency response up to 40 kHz for sensitive quadraphonic discs.
Specifications
| Motor | Brush-less DC servo motor |
| Drive type | Direct-drive |
| Platter | 31 cm aluminium alloy diecast |
| Speeds | 33 1/3 & 45rpm |
| Wow & Flutter | 0.05% WRMS (FG measured) |
| S/N ratio | 58 dB (DIN-B) |
| Tonearm type | static balance S-shape |
| Effective length | 221 mm (22.1 cm) |
| Overhang | 15.5 mm |
| Tracking force range | 0...3g |
| Cartridge weight range | 4...14g |
| Componentry | 12 transistors 19 diodes |
| Power consumption | 5.2W max. |
| Dimensions | 48 x 18.5 x 41.5 cm |
| Weight | 10.5 kg |
Design
The PL-51A uses a two-density base with large insulators to isolate the turntable from external vibrations. Its tonearm is engineered to handle lightweight cartridges and advanced disc formats, including CD-4 and quadraphonic records. The platter is dynamically balanced for minimal runout, and the brushless DC servo motor ensures stable speed with ultra-low wow and flutter. LSC output cables reduce stray capacitance, preserving high-frequency detail on demanding formats. Pitch control is calibrated via stroboscope, allowing fine adjustment within ±2%.
Context
The PL-51A was the Japanese-market name for the PL-1200A, both representing slightly updated versions of the 1972 PL-51 and PL-1200 models. Released in 1974, it targeted users seeking high accuracy and compatibility with emerging quadraphonic and stereo-quad (SQ) vinyl formats.
Market
Original pricing for the PL-51A was 51,000 ¥ in 1974. Maintenance notes indicate that the electrolytic capacitors in the unit are the same as those used in the PL-1400 (and PL-71), with some owners upgrading the main power supply capacitor to 1000uF for improved performance.
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