Audio Database Technics SU-3000 29,800yen(around the 1973 time) Description 　 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 Tuner:96dB AUX1, 2:96dB MIC:65dB 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 <Synthesis> 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