ADC 1700DD (1979)
Little is documented about the ADC 1700DD outside of a single period review. The record shows a semi-automatic, quartz-lock direct-drive turntable introduced around 1979 at a list price of $279.95. Audio (December 1979, p.84) published the manufacturer's specs and a brief description. It noted the table was attractively priced for a quartz-lock design.
The 1700DD used a quartz-referenced, phase-locked-loop direct-drive motor. It offered two speeds and had a variable pitch control with a six percent range. Wow and flutter was rated at less than 0.03% rms, rumble at -70 dB DIN "B," and drift at 0%. Tracking error was specified at less than 0.5 degrees per inch. With the dust cover closed, the turntable measured 18.5 inches wide, 15 inches deep, and 6 inches high.
Beyond that single Audio piece, no service manuals, advertising materials, or further reviews have surfaced in the Archive's research. The 1700DD appears to have been a straightforward, mid-priced quartz-lock table from ADC's late-1970s lineup. It looks competent on paper, and that is about all the paper there is.
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