Technics SU-7300
¥ 35,800 (around 1976)
Commentary
A pre-main amplifier with a side terminal structure to realize a straight circuit structure.
A side terminal structure is adopted. All input signal terminals are laid out on the right side, and the speaker terminals are laid out on the left side. This realizes a circuit configuration according to the signal flow.
The equalizer circuit uses an IC of the first stage differential amplifier configuration with current mirror load.
In the pre-drive stage of the main amplifier section, a differential amplifier of the current mirror load is configured in the first stage to realize a low distortion factor. In addition, since tone control is performed using the NF circuit of the main amplifier, the circuit block has a simple structure consisting of an equalizer section and a power amplifier section.
The power supply circuit is equipped with a high-density winding transformer and 6,800 μ Fx2 electrolytic capacitor.
Equipped with a power meter that can switch the range between 0 dB and -10dB.
Germanium diode is used for rectification to improve linearity at small output power.
With independent tape monitor and recording mode selectors, you can switch the tape monitor switch to a different source while dubbing.
Equipped with a low filter and loudness switch.
Model Rating
Type | Stereo pre-main amplifier | ||||
Power Amplifier Unit | |||||
Effective output (both channels) |
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Total harmonic distortion factor | 0.08% | ||||
Output Bandwidth (both channels, 8 Ω) | 8 Hz to 55 kHz, -3dB | ||||
Residual noise | 0.7mV | ||||
Damping factor | 45 (8 Ω) | ||||
Load impedance | Main or Remote : 4 Ω ~ 16 Ω | ||||
Preamplifier Section | |||||
Input Sensitivity / Impedance | Phono : 2.5mV/47k Ω Tuner, Aux, Tape1, 2 : 150mV/47k Ω |
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Phono Maximum Input (1 kHz, RMS) | 150mV | ||||
Signal-to-noise ratio (IHF-A) | Phono:78dB Tuner:97dB |
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Frequency characteristic | Phono : RIAA standard curve ± 0.3 dB Tuner : 7 hz to 80 khz + 0 to 3 db |
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Tone control | Bass : 50 Hz, ± 12 dB Treble : 20 kHz, ± 12 dB |
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Filter | Low : 30 Hz, -6dB/oct. | ||||
Loudness control (Volume -30dB) | 100Hz:+6dB | ||||
Output voltage | Tape1 and 2 : 150 mV | ||||
<General> | |||||
Pwer | 100 VAC, 50/60Hz | ||||
Power consumption | 95W | ||||
External dimensions | Width 410x Height 140x Depth 315 mm | ||||
Weight | 6.0kg |