The C-77 preamplifier is the control centre of the system, offering a comprehensive input complement that includes both moving-magnet and moving-coil phono stages — the MM input accepts 2.5mV at 47kΩ, whilst the MC input is sensitive down to 0.1mV at 10Ω, making the C-77 compatible with a wide range of cartridges. Two tape monitor loops, a tuner input, and an auxiliary input are also provided. Tone controls offer ±10dB at bass and treble frequencies, with an infinitely variable loudness contour, high and low filters, and a mono switch. A source cross-fader is fitted, along with a mute function and front-panel headphone socket. The preamplifier outputs to the power amplifier via standard line-level connection.
The B-77 power amplifier delivers 60 watts per channel into 8 ohms (RMS, 20Hz–20kHz), with 70 watts available at 1kHz. Frequency response extends from 5Hz to 70kHz, and total harmonic distortion is quoted at just 0.03% — figures that demonstrate a clean, low-noise design with ample headroom. The amplifier can drive two pairs of loudspeakers simultaneously, and an LED peak display with spectral analyser and auto-dimmer provides visual feedback of output levels. The B-77 draws 330 watts maximum and is built on a chassis measuring 430mm wide.
The T-77 is a digital synthesizer AM/FM stereo tuner covering 87.5–108MHz on FM and 525–1605kHz on medium wave. Signal-to-noise ratio is quoted at 68dB on FM and 45dB on MW, with 60dB selectivity. The digital tuning scale provides accurate frequency readout, and the tuner offers both automatic and manual station selection.
Together, the three units present a coherent and capable system that offers genuine flexibility: the MC phono stage allows direct connection of a low-output moving-coil cartridge without an external step-up transformer, the tone controls and filters permit tailoring of the sound to room and source, and the power amplifier has sufficient output to drive most loudspeakers of the period with authority.
Technical Specifications (Source: HiFi Engine / HiFi Wiki)
Sansui C-77 Stereo Preamplifier
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Type: Stereo Preamplifier
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Frequency Response: 5Hz – 70kHz (+0.5dB, –2dB)
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Total Harmonic Distortion: 0.03%
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Signal-to-Noise Ratio: 80dB (Phono MM); 60dB (Phono MC); 90dB (High Level)
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Input Sensitivity & Impedance:
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Outputs: Tape Rec (150mV), Headphones
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Tone Controls: ±10dB bass; ±10dB treble
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Loudness: Infinitely variable
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Filters: High filter; Low filter (subsonic)
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Other Features: Mono switch, Mute, Source cross-fader
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Dimensions (W x H x D): 430 x 74 x 247 mm
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Weight: 3.1 kg
Sansui B-77 Stereo Power Amplifier
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Type: Stereo Power Amplifier
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Power Output: 60W RMS per channel into 8Ω (20Hz–20kHz); 70W per channel at 1kHz
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Frequency Response: 5Hz – 70kHz
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Total Harmonic Distortion: 0.03%
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Input Sensitivity: 150mV / 47kΩ (Line In)
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Outputs: 2 pairs of loudspeaker terminals
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Features: LED peak display, Spectral analyser, Auto dimmer
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Power Consumption: 330W max
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Dimensions (W x H x D): 430 x 148 x 230 mm
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Weight: 6.4 kg
Sansui T-77 AM/FM Stereo Tuner
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Type: Digital Synthesizer Tuner
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Tuning Bands: FM, MW
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FM Tuning Range: 87.5 – 108 MHz
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MW Tuning Range: 525 – 1605 kHz
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Signal-to-Noise Ratio: 68dB (FM); 45dB (MW)
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Selectivity: 60dB
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Distortion Factor (Stereo): 0.25%
Year of Production (all units): 1980 – 1982 Country of Origin (all units): Japan
Why Buy From Us
With over 40 years of experience in the Hi-Fi industry, we are well placed to assess and test equipment of this type. Every item we list is fully inspected and tested before sale — this set was checked by Andrew in our workshop.
When you buy from us you can expect:
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Full inspection and testing prior to listing — not simply a visual check
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A 3-month guarantee on every item we sell
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Transparent descriptions with no omissions
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Professional packaging to ensure safe delivery
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After-sales support available by phone or email should you have any questions
Summary
The Sansui B-77, C-77, and T-77 form a complete and well-matched separates system from the early 1980s, offering a moving-coil phono stage, 60 watts per channel of clean power, and digital synthesizer tuning in a trio of cosmetically matched chassis. This set is in great overall condition with minor marks consistent with age. This is a three-unit set listed as a single lot. Please feel free to get in touch with any questions prior to purchase.
