Technics RS-M275X
Documentation on the Technics RS-M275X is thin. The fullest record is an equipment profile in Audio (March 1983, p.70). It carried the manufacturer's specifications for a cassette deck with three noise-reduction systems: Dolby B, Dolby C, and dbx.
Per those published specs, frequency response was rated at 20 Hz to 17 kHz on normal tape. That extended to 18 kHz with CrO₂ tape and 19 kHz with metal tape. Signal-to-noise was quoted at 68 dB CCIR/ARM with Dolby B, 76 dB with Dolby C, and 92 dBA with dbx. Input sensitivity was listed as 0.25 mV for microphone and 60 mV for line.
That is about all there is. No production years, original price, or deeper design details have turned up in the available sources. The RS-M275X is a Technics cassette deck from the early 1980s, and little else is on record.
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