Audio Database

SU-3000
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)
Effective power (RMS)
Single-channel operation : 18W/18W (4 Ω)
14W/14W (8 Ω)
Both channels operate 14W + 14W (4 Ω)
12W + 12W (8 Ω)
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
Signal-to-noise ratio (IHF, A) Phono:75dB
Tuner:96dB
AUX1, 2 : 96 dB
MIC:65dB
Tape monitor
Tape1 Rec Out : 200mV/1k Ω
Playback : 200mV/30k Ω
Tape2 Rec/Play (DIN) : 200mV/30k Ω, 30mV/80k Ω
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
Tone control Bass : 50 Hz, + 10 dB to -12dB
Treble : 10 kHz, + 10 dB to -10dB
Loudness control
(Volume -30dB)
100 Hz, + 10 dB
10 kHz, + 5 dB
Low filter 60 Hz, -6dB/oct.
High filter 6 kHz, -6dB/oct.
<General>
Semiconductor used Transistor : 22
Diode : 4
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