Technics SU-8077 (1979)
A mid-tier integrated DC amplifier from Technics' New Integrated DC-Amp series, with direct-coupled circuitry and MC phono input support.
Overview
The Technics SU-8077 is a pre-main amplifier, built as a Middle Class unit in the New Integrated DC-Amp series. Technics/Panasonic made it around 1979. It uses a straight DC method, with no coupling capacitors between the input and speaker output stages, aiming for low distortion and wide frequency response. It takes both MM and MC phono cartridges directly. The MC input uses a newly developed low-noise dual FET ICL in the first stage to cut noise. A pure electronic fluorescent display monitors output level. Tone controls, loudness compensation and selectable filters are included.
Specifications
| Effective power 20 Hz to 20 kHz | 60W + 60W (8 Ω, 0.02%) |
| Effective power 1 kHz | 62W + 62W (8 Ω, 0.02%) |
| Total harmonic distortion rate (20 Hz to 20 kHz) | 0.008% (at rated output -3dB) |
| Power Bandwidth (THD 0.05%) | 5 Hz to 100 kHz |
| Frequency Response (Straight DC) | 0.2 Hz ~ 120 kHz +0 -3dB |
| SN ratio (IHF-A, straight DC) | 108dB |
| Residual noise (straight DC) | 300 μV |
| Damping factor | 40 (8 Ω) |
| Load impedance Main or Remote | 4 Ω ~ 16 Ω |
| Load impedance Main + Remote | 8 Ω ~ 16 Ω |
| Input Sensitivity / Impedance Phono MM | 2.5mV/47kΩ |
| Input Sensitivity / Impedance Phono MC | 170 μV/47Ω |
| Input Sensitivity / Impedance Tuner, Aux, Tape | 200mV/47kΩ |
| Phono maximum allowable input (1 kHz, RMS) Phono MM | 150mV |
| Phono maximum allowable input (1 kHz, RMS) Phono MC | 8mV |
| Pre-part total harmonic distortion factor (20 Hz to 20 kHz) Phono MM → Rec out | 0.02% |
| Phono signal-to-noise ratio (IHF-A) Phono MM | 88dB |
| Phono signal-to-noise ratio (IHF-A) Phono MC | 70 dB (250 μV input) |
| Phono frequency characteristics | 20 Hz to 20 kHz, RIAA standard curve ± 0.2 dB |
| Tone control Bass | ± 7.5 dB (50 Hz) |
| Tone control Treble | ± 7.5 dB (20 kHz) |
| Filter High | 7 kHz, -6dB/oct. |
| EQ subsonic | 30 Hz, -12dB/oct. |
| Loudness control (VR -30dB) | +7dB(100Hz) |
| Muting | -20dB |
| Output voltage Rec out | 200mV |
| Power | 100 VAC, 50Hz/60Hz |
| Power consumption | 128W |
| External dimensions | Width 450 x Height 142 x Depth 360 mm |
| Weight | 12.5kg |
Design
The SU-8077 uses a straight DC method, so there are no capacitors in the signal and feedback paths. That reduces phase shift and distortion. A single concentrated power block keeps high-frequency distortion down. The peak power meter uses a pure electronic fluorescent display. The first stage of the phono section is a newly developed low-noise dual FET ICL. At center position, the tone control circuit takes the control element out of the signal path. The Rec selector is independent, which makes it easier to operate. It came in silver and black versions.
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