ADC RSQ-31
Little is documented about the ADC RSQ-31. It was a turntable made by American Diagnostic Corporation (ADC), and its only footprint in surviving documentation is a single third-party replacement-stylus listing. A needle sold under the ADC RSQ-34 name, described as a turntable replacement stylus, is offered through Martek Distribution for CAD $32.97. It is said to fit the RSQ-31 along with the RSQ-32, RSQ-33, RSQ-34, RSQ-36, RKSE, QLM30, and QLM32.
Beyond that cross-reference, nothing is recorded. No production years, no original price, no technical specifications, no brochures, no reviews, no schematics. The stylus listing is the only source that mentions the model at all, so the RSQ-31's exact place in ADC's turntable lineup is unclear. There are no market prices or condition reports either, and as of this writing no exact RSQ-31 listings are live on eBay. The ADC name from this era has real collector appeal, often described as a treasure trove of undervalued gems, though the attention centers on the XLM moving magnet cartridges and the metal-faced Sound Shaper equalizers.
Known facts:
- Turntable by American Diagnostic Corporation (ADC)
- No technical specifications, production dates, or original price documented
- Replacement stylus: ADC RSQ-34, CAD $32.97 via Martek Distribution
- Stylus also listed as compatible with RSQ-32, RSQ-33, RSQ-34, RSQ-36, RKSE, QLM30, QLM32
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