Pioneer PLC-590
A quartz-locked direct-drive turntable sold as a bare chassis — you brought your own arm, and Pioneer assumed you'd bring a good one.
Overview
The PLC-590 arrived at a moment when Japanese direct-drive was still fighting for respect against the British belt-drive establishment, and Pioneer's pitch was simple: build a motor and platter so stable that the arm becomes the only variable worth arguing about. The company sold it without a tonearm, with pre-cut mounting plates for Pioneer arms and the SME pattern, plus blank plates for anything else. That decision tells you most of what you need to know about who this deck was for — not the casual listener buying a complete table, but the enthusiast who already had opinions about effective mass and cartridge compliance.
Hi-Fi-Stereo-Buyers (March 1978, p.71) laid out the pricing plainly: the PLC-590 was $550.00 with base and dust cover, and the companion PA-1000 tonearm — sold separately, less pickup — added $100.00. The magazine described the deck as a two-speed (33 and 45) turntable, and its test report singled out one trait that matters more than any spec sheet number: the PLC-590 was "uncommonly insensitive to external shock and vibration," with the stylus tracking grooves even under severe external motion. For anyone who has fought acoustic feedback in a small listening room with the speakers too close to the rack, that sentence is worth more than a page of wow-and-flutter figures.
The other headline feature was quartz lock speed control, which Audio (October 1977, p.112) noted as Pioneer's entry into the quartz PLL field. The magazine's show report from that period also flagged the practical side of the no-arm design — pre-cut plates for Pioneer and SME arms, blanks available for everything else. That flexibility is the reason the PLC-590 turns up today in such varied configurations, and it's why the deck's reputation is so tangled up with whatever arm happens to be bolted to it.
The press pool for this table was unusually deep for a Japanese direct-drive of the period. An Audio advertisement from March 1979 (p.—) claimed that cartridge and tonearm reviewers for Hi-Fi News & Record Review and Audio had chosen the Series 20 PLC-590 as a common test platform — and the magazine's own arm reviews back that up. When Audio tested the Infinity "Black Widow" tonearm, the PLC-590 served as the mounting platform precisely because its SME adaptor made swapping arms quick work. That's a genuine endorsement of the chassis: reviewers used it as a reference bed, not as a curiosity.
The quartz lock holds speed with the indifference you'd expect from a PLL system, and the plinth-and-base arrangement — sold as a package with the dust cover at that $550 figure — does the isolation work that the Hi-Fi-Stereo-Buyers testers measured.
The honest caveats are the usual ones for a deck of this age and type. The dust cover and base are part of the package and part of the price — a bare chassis without them is a different proposition. The pre-cut arm plates are only useful if you have the right arm or can source a blank, and an SME-pattern arm is the path of least resistance. Beyond that, the record is thin: production years, platter mass, wow-and-flutter figures, and dimensions simply aren't documented in the sources available here, and it's better to say so than to invent them. What is documented is enough to place the PLC-590 accurately — a quartz-locked, two-speed direct-drive built to be a platform, priced as a serious component in 1977–78, and trusted by contemporary reviewers as the bed on which they tested other people's tonearms.
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