The Pioneer PL-31 D is a direct-drive turntable that was part of Pioneer's lineup in the late 1970s and early 1980s. It features a high-torque direct drive motor system that provides stable playback and low wow and flutter. The PL-31 D is designed with an adjustable tonearm and offers a range of features including pitch control and a built-in strobe light for speed monitoring. The turntable is constructed with quality materials to reduce vibration and resonance, aiming to deliver accurate sound reproduction.