Sansui AU 555A

Repair Maintenance

Japan 1969

Power amplifier
Output power 2 x 25 W 8 Ohms
Output power 2 x 33 W 4 Ohms
Total harmonic distortion 0.5%
Intermodulation distortion 0.5%
Power bandwidth 20 Hz - 40 kHz
Frequency response (1W) ± 1dB 20Hz - 40kHz
Stereo separation 60 dB
100 dB signal to noise ratio
Final input sensitivity 700 mV 100 kOhms
damping factor 50 to 8 Ohms

Preamplifier
700 mV pre-out output level
Maximum pre-out output level 5 V
Total harmonic distortion 0.1%
Frequency response ± 1 dB 20 Hz - 30 kHz
Stereo separation of phono input 45 dB
Line input stereo separation 50 dB
Phono signal to noise ratio 70 dB
Line noise signal ratio 80 dB
Phono input sensitivity 2 mV 50 kOhms
Sensitivity of line inputs 180 mV 50 kOhms

Bass tone control ± 12 dB 30 Hz
Mid tone control ± 5 dB 1.5 kHz
Treble control ± 10 dB 15 kHz
Loudness +8 dB 50 Hz, +3 dB 10 kHz
Bass filter -8 dB 50 Hz
Filtro alti -7 dB 10 kHz