Audio Database


Technics SU-3000 29,800yen(around the 1973 time)

The Integrated Amplifier which was excellent in CP which challenged the threshold of the cost cut while maintaining the outstanding property.

The power amplifier stage consists of whole page hardwired-connection OCL circuitries which adopted the differential-amplification circuitry as the first rank.
Moreover, the developed PNP pair transistor is used as an object for differential amplifier.

Especially the equalizer circuitry has two-step hardwired-connection composition which combined the PNP-NPN transistor of the low noise selected carefully.
Moreover, the high supply voltage of the equalizer stage is taken by +-2 power source, and the large allowable input can be taken.

It has the amplifier only for a mic and a mic volume and a source volume can adjust level adjustment separately, respectively.

2 sets of tapes monitor circuitries are carried.

The tone control is carried.


Rating of a mode
Form Solid-state Integrated Amplifier
Circuit system Whole page hardwired-connection OCL circuitry
<Power amplifier part>
Music power (IHF) 50W (4ohms)
38W (8ohms)
Effective output (RMS)
At the time of a channel operation of one of the two : 18W/18W (4ohms)
14W/14W (8ohms)
At the time of both channel operation 14W+14W (4ohms)
12W+12W (8ohms)
Power Band Width (IHF) 5Hz - 50kHz-3dB
Distortion 0.8% or less (at the time of an effective output)
Cross modulation distortion (60Hz:7kHz=4:1) 0.8% or less (at the time of an effective output)
Remains noise 0.7mV
Dumping factor 35 (at the time of an 8-ohm load intensity)
<Preamplifier part>
Input sensitivity/impedance Phono: 2.5mV / 47kohm
Tuner: 200mV / 30kohm
AUX1, 2:200mV / 30kohm
MIC: 3mV / 47kohm
SN ratio (IHF, A) Phono:75dB
AUX1, 2:96dB
Tapes monitor
Tape1 Rec Out: 200mV / 1kohm
Playback: 200mV / 30kohm
Tape2 Rec/Play(DIN): 200mV / 30kohm, 30mV / 80kohm
Phono maximum permissible input 90mV/1kHz(RMS)
Frequency characteristic Deflection of less than ±1dB from a Phono:RIAA standard curve
Tuner: 10Hz - 50kHz, and +0 -3dB
AUX1, 2:10Hz - 50kHz, and +0 -3 dB
Tone control Bass: 50Hz, +10dB--12dB
Treble: 10kHz, +10dB--10dB
Loudness control
(Volume -30dB)
100Hz, +10dB
10kHz, +5dB
A low light filter 60Hz-6dB / oct
A high light filter 6kHz-6dB / oct
The semiconductor used Transistor: 22
Diode: Four
Power source AC100V, 50/60Hz
AC outlet Unswitched: One line
Power consumption 45W
Dimensions Width 336x height 115x depth of 295mm
Weight 5.3kg