Sansui G-6700 (1980–1982; some sources list 1979–1980)
The G-6700 is the middle child of Sansui's G-series receivers. It sits between the 75-watt G-5700 and the 120-watt G-7700, and it shares its service manual with both - a good sign of how closely related the three are. The model is rated at 90 watts per channel into 8 ohms, both channels driven, 20 Hz to 20 kHz, with no more than 0.025% total harmonic distortion. That THD figure matches the G-7700's and is tighter than the G-5700's 0.03%. The G-6700 also shares the bigger model's 60 V/µsec slew rate. Damping factor is 50 into 8 ohms across 20 Hz to 20 kHz, and the amp section is quoted as flat from DC to 200 kHz, +0 dB/−3 dB. The phono stage takes 2.5 mV into 47 kilohms and has two phono inputs, with a maximum input of 210 mV before distortion exceeds 0.1%. Line-level inputs (TAPE-1, 2 PLAY, TAPE/AUX) want 150 mV into 47 kilohms, and the tape outputs deliver 150 mV. Hum and noise is quoted at 78 dB on phono and 95 dB on the line inputs.
The tuner is quartz-locked. The parts list for the shared chassis has a "quartz locked" indicator lamp alongside the FM stereo and safety-operate lamps. The FM section covers 88 to 108 MHz with 300-ohm balanced and 75-ohm unbalanced antenna inputs. Stereo separation is quoted at 35 dB at 100 Hz, 42 dB at 1 kHz, and 30 dB at 10 kHz. The AM section tunes 530 to 1,600 kHz. The G-6700 carries bass and treble tone controls, subsonic and treble filters, loudness and audio muting, a mic-level control, and a speaker selector. Period coverage is thin but exists. HiFi-Stereo (1980, p.53) listed the G-6700 as similar to the G-7700 but with 90 W/ch. It noted FM tuner sensitivity of 1.9 µV IHF, an FM S/N of 75 dB, and a price of $730, which matches the $730 figure that circulates for this model. The same listing says the front panel came in silver or black.
Physically the G-6700 is a full-width receiver: 505 mm wide, 182 mm high, and 442 mm deep, at 16.1 kg net (18.4 kg packed). Power requirements covered 100, 120, 220, and 240 V at 50/60 Hz, with North American units at 120 V/60 Hz. Rated consumption is 330 W (420 VA). Production is generally given as 1980-1982, though some listings place it at 1979-1980. At least one owner has reported the 90-watt rating as measured into 4 ohms rather than 8, but the manual's 8-ohm figure is the one to trust. A commonly reported fault is loss of stereo in the FM tuner, and owners have noted the protection indicator tripping at higher volume. Service manuals and a reproduction wood case are both available.
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