Audio Database


Aurex SC-77
120,000 yen(an age -- unknown)

SC-77 is considering it as monophonic amplifier, the influence of the sound in right and left is eliminated, and high-quality sound-ization is attained more.

The 2 steps of first rank cascode connection three-step Darlington whole page direct connection pure complimentary OCL circuit is adopted.
In the output stage of the push pull system, the output of 120W has been obtained at 20Hz - 20kHz.

The input gain change-over switch of the amount of NF(s) variable system is carried.
Usually, although Input sensitivity is 1.6V, it is possible to improve by about 10dB with a switch.

In order to prevent amplifying a low-pass unnecessary noise as it is, the Subsonic Filter was prepared and 10Hz or less is cut by 12 dB/oct.

An Attenuator type level control is carried.

The efficient large-sized toroidalcore transformer is carried in the power-source part.
Moreover, also paying attention to a power source capacitor, 11000 micro F is carried two.
This electrolytic condenser reduces the etching area of electrode foil, and is striving for the fall of impedance as a low magnification structure where large electric current density can be taken.

The survey data sheet by a computer (CADIS) is attached.


Rating of a mode
Form Monophonic power amplifier
Circuit system First rank cascade connection 2 steps of differential whole page direct connection OCL
Three-step Darlington Parallel push pull system
Specification semiconductor Transistor x32, diode x21
Effective output (20Hz - 20kHz) 120W (0.05% distortion, 8ohms)
170W (0.05% distortion, 4ohms)
(20Hz - 20kHz)
At the time of an effective output : 0.05%
At the time of 60W output : 0.04%
At the time of 1W output : 0.05%
It is 1kHz at the 60W output time. : 0.002%
It is 50kHz at the 60W output time. : 0.02%
It is 100kHz at the 60W output time. : 0.08%
Cross modulation distortion
At the time of an effective output : 0.08%
At the time of 1W output : 0.03%
output bandwidth (IHF, 8ohms) 5Hz - 100000Hz (distorted 0.1%)
Frequency response (at the time of 1W output) 5Hz-100000Hz+0dB-0dB
Input sensitivity/impedance 1.6V/50kohm (being a switch 10dB up)
Dumping factor (8ohms) 50 or more
Signal to noise ratio (IHF A network) 115dB
Remains noise 0.3mV
Subsonic Filter 10Hz(12dB/oct)
Power source AC100V 50Hz/60Hz
Power consumption 165W
Dimensions Width 450x height 93x depth of 375mm
Weight 11kg