Audio-Technica AT-666EX (c. 1982–1984)
Little is documented about the Audio-Technica AT-666EX outside a handful of early-1980s equipment reviews, but those reviews make its purpose clear. It was a vacuum disc stabilizer - a retrofit accessory that clamped a record flat against the platter using suction. It worked as a warp reducer and resonance damper for an ordinary turntable.
The idea had been around professionally. Vacuum chucks had long held lacquer blanks in cutting rooms, and Luxman had brought vacuum stabilization to home turntables a year earlier, but only in its costlier models. High Fidelity (December 1982, p.12) noted that Audio-Technica's version stood out because it was an add-on. Owners could retrofit even a modest turntable with what the magazine found to be a remarkably effective warp-reducer and resonance damper. The AT-666EX was built around a die-cast aluminum platter pad fitted with soft rubber sealing rings. A vacuum drew the record down firmly against the pad.
Audio (January 1983, p.56) published the manufacturer's specifications in an equipment profile. The stabilizer plate was 300 mm (11.81 in) in diameter and 9.5 mm thick, weighed 1.4 kg, and was machined from duralumin. Vacuum limiter operation was rated at over 350 mm Hg (3 V DC). The control unit measured a compact 71 mm wide × 41 mm high × 131 mm deep.
A later Audio report (February 1984, p.65) measured essentially flat response - 0 dB at 40 Hz, +1.75 dB at 50 Hz, -0.5 dB at 8 kHz, and 0 dB at 12 kHz. The reviewer was especially impressed with how the stabilizer handled the high recorded velocities on audiophile pressings such as Telarc's 1812.
No retail price, confirmed production years, or owner documentation appear in the surviving record. The AT-666EX seems to have been a niche accessory for the serious turntable owner, and it faded from the catalogs quietly.
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