Technics SU-7700II
¥ 52,800 (around 1977)
Commentary
A pre-main amplifier that has been improved based on the SU 7700.
A constant voltage power supply of ± 2 power supply using transistor and zener diode is adopted for the preamplifier section.
The common emitter power supply of the first stage differential amplifier of the main amplifier is constantly electrified by a transistor, and is also received by a current mirror.
Model Rating
| Type | Stereo pre-main amplifier |
| Main Amplifier Section | |
| Effective output (both channel drive) | 60W + 60W (8 Ω, 20 Hz to 20 kHz) 66W + 66W (8 ohm, 1 kHz) |
| Total harmonic distortion factor | 0.03% (20 Hz to 20 kHz) |
| Cross modulation distortion factor | 0.03% |
| Output bandwidth | 7 hz to 40 khz -3dB |
| Residual noise | 0.5mV |
| Damping factor | 60 (8 Ω) |
| Load impedance | Main or Remote : 4 Ω ~ 16 Ω Main + Remote : 8 Ω ~ 16 Ω |
| Preamplifier Section | |
| Input Sensitivity / Impedance | Phono : 2.5mV/47k Ω Tuner, Aux : 150mV/47k Ω Playback/Tape1, Tape2 : 150mV/47k Ω |
| Phono maximum allowable input (1 kHz, RMS) | 210mV |
| Signal-to-noise ratio (IHF-A) | Phono:85dB Tuner, Aux : 97 dB |
| Frequency characteristic | Phono : RIAA standard curve ± 0.2 dB Tuner, Aux : 7 hz to 80 khz -3dB |
| Tone control | Bass : ± 12 dB (50 Hz) Treble : ± 12 dB (20 kHz) |
| EQ Subsonic Filter | 30 Hz, -12dB/oct. |
| Loudness control (-30dB) | +8dB(100Hz) |
| Muting | -20dB |
| Output voltage | Rec out, Tape1, 2 : 150 mv |
| <General> | |
| Pwer | 100 VAC, 50Hz/60Hz |
| Power consumption | 155W |
| External dimensions | Width 410x Height 142x Depth 340 mm |
| Weight | 8.5kg |