Luxman PD-310 (1981)
The PD-310 is a high-mass, vacuum-stabilized turntable built for flatness and precision. It came out at the peak of Japanese analog engineering.
Overview
The Luxman PD-310 is a belt-driven turntable introduced in December 1981 as a high-end component in Luxman's analog lineup. Most turntables of its era had nothing like its vacuum stabilization system. That system needed the separately sold VS-300 unit, which supplied both power and airflow to pull the record flat against the platter. It eliminated warping-induced distortion and damping inconsistencies between the record and platter surface. The platter is a 30 cm aluminum die-cast piece weighing 3.5 kg. It is driven by a brush & slotless DC servo motor with FG servo control, for stable rotation with minimal vibration. Speeds are 33 1/3 and 45 rpm, with an adjustment range of +10% to -6% on both. It reaches operating speed in approximately three seconds. Wow and flutter are very low at 0.03%, and the signal-to-noise ratio exceeds 60 dB. The chassis is a 30 mm-thick softwood high-density particle board, with a 5 mm steel plate sandwiched above and below the bearing and arm base mounting area for added rigidity. Large natural rubber insulators double as adjustable feet and isolate the turntable from external vibrations.
Design
The PD-310's design centers on mechanical stability and record flatness. The vacuum disk stabilizer is activated via the VS-300 unit and adsorbs the record to the platter in a single touch operation. An automatic servo function regulates airflow to keep the seal consistent. The motor is mounted through an insulator to suppress micro-vibrations. There is a line-phase sensor on the VS-300 side for polarity adjustment. The turntable supports multiple tonearm bases (TF and TG series), and slight overhang adjustment is possible depending on the arm base bolt hole configuration. Two belts are included, a stainless steel wire belt and a urethane rubber belt, so the drive system can be tuned. The dust cover is 4 mm thick acrylic molding. The whole unit weighs 16 kg, which gives it an inert, resonance-resistant structure.
Market
The Luxman PD-310 was sold without a tonearm for ¥95,000 at launch in December 1981. The vacuum unit VS-300 was priced separately at ¥30,000. Additional accessories included the Replacement Sealing Pad Set SP-3 (¥2,000), and arm bases for the TF (¥5,000) and TG (¥10,000) series. No current market values are documented in the source material. Common issues noted in user reports include vacuum seal degradation and speed instability, often requiring recapping or servicing of the VS-300 unit.
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