ADC 1700DD
The ADC 1700DD is a semi-automatic, quartz-lock direct-drive turntable that appeared in the late 1970s. The full spec sheet ran in Audio (December 1979, p.84). Magazine advertisements ran in HiFI-Stereo from late 1978 through 1980.
Speed stability was the headline. Wow and flutter was rated at less than 0.03% WRMS, rumble at -70 dB DIN B, and drift at zero percent. Variable pitch covered a six percent range. Tracking error was specified at less than 0.5 degrees per inch.
The 1700DD measured 18.5 inches wide by 15 inches deep by 6 inches tall including the dust cover. Its original price was $279.95.
Beyond that single Audio spec sheet and the ad campaign, no service manual, user manual, or detailed review has surfaced in the archive. Production years are unconfirmed, though the ads bracket it from at least late 1978 into 1980. It appears to have been ADC's mid-priced quartz-lock offering of the period - priced below the company's top-tier models but sharing the same core direct-drive and low-mass tonearm philosophy.
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