Technics SU-3000
¥ 29,800 (around 1973)
Commentary
An excellent pre-main amplifier of CP that challenged the limit of cost reduction while maintaining excellent characteristics.
The power amplifier stage is composed of all stages directly connected OCL circuits with a differential amplifier circuit at the first stage.
Also, a PNP pair transistor developed for a differential amplifier is used.
The equalizer circuit is composed of two stages connected together with specially selected low-noise PNP-NPN transistors.
The power supply voltage of the equalizer stage is set high by the + -2 power supply, and the allowable input is set large.
It is equipped with a microphone amplifier, and the microphone volume and source volume can be adjusted separately for level adjustment.
Two pairs of tape monitor circuits are installed.
Equipped with tone control.
Model Rating
Type | Solid state pre-main amplifier | ||||
Circuit system | All-stage direct connection OCL circuit | ||||
Power Amplifier Unit | |||||
Music Power (IHF) | 50W (4 Ω) 38W (8 Ω) |
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Effective power (RMS) |
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Power Band Wiz (IHF) | 5 Hz to 50 kHz, -3dB | ||||
Distortion factor | 0.8% or Less (Actual Output) | ||||
Intermodulation distortion factor (60 hz : 7 khz = 4 : 1) | 0.8% or Less (Actual Output) | ||||
Residual noise | 0.7mV | ||||
Damping factor | 35 (at 8 Ω Load) | ||||
Preamplifier Section | |||||
Input Sensitivity / Impedance | Phono : 2.5mV/47k Ω Tuner : 200mV/30k Ω AUX1, 2 : 200mV/30k Ω MIC : 3mV/47k Ω |
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Signal-to-noise ratio (IHF, A) | Phono:75dB Tuner:96dB AUX1, 2 : 96 dB MIC:65dB |
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Tape monitor |
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Phono maximum allowable input | 90mV/1kHz(RMS) | ||||
Frequency characteristic | Phono : within ± 1 dB of deviation from RIAA standard curve Tuner : 10 hz to 50 khz, + 0 to 3 db AUX1, 2 : 10 Hz to 50 kHz, + 0 -3dB |
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Tone control | Bass : 50 Hz, + 10 dB to -12dB Treble : 10 kHz, + 10 dB to -10dB |
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Loudness control (Volume -30dB) |
100 Hz, + 10 dB 10 kHz, + 5 dB |
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Low filter | 60 Hz, -6dB/oct. | ||||
High filter | 6 kHz, -6dB/oct. | ||||
<General> | |||||
Semiconductor used | Transistor : 22 Diode : 4 |
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Pwer | 100 VAC, 50/60Hz | ||||
AC outlet | Unswitched : 1 line | ||||
Power consumption | 45W | ||||
External dimensions | Width 336x Height 115x Depth 295 mm | ||||
Weight | 5.3kg |