Hitachi HA 8700

Repair

Japan 1979

Power amplifier
Power: 2 x 100W 8 Ohms
Power: 2 x 130W 4 Ohms
Power bandwidth 5Hz -100kHz
Frequency response coupled +0 -1 dB DC - 100 kHz
Frequency response decoupled +0 -1 dB 5 Hz - 100 kHz
Total harmonic distortion 0.03%
Total harmonic distortion at half power 0.005%
Intermodulation distortion 0.008%
Half power intermodulation distortion 0.003%
Signal to noise ratio 115 dB
Damping factor 80 to 8 Ohms
Stereo separation 75 dB
Input sensitivity 1 V 47 kOhms

Preamplifier
Phono input sensitivity mm 2,5 mV 22, 47, 100 kOhms (max 300 mV)
Phono input sensitivity mc 0.25 mV 22, 47, 100 Ohms (max 30 mV)
Sensitivity of line inputs 150 mV 47 kOhms
Pre output level 1 V 600 Ohms
Frequency response +0 -2 dB 10 Hz - 100 kHz

Phono signal to noise ratio mm 90 dB
Phono signal to noise ratio mc 73 dB
Line noise signal ratio 100 dB
Bass tone control ± 10 dB at 100 Hz
Treble control ± 10 dB at 10 kHz
Loudness +8 dB a 100 Hz
Filtro subsonico 18Hz 6 dB/oct
Total harmonic distortion phono 0.005% mm
Total harmonic distortion 0.005% line
Bass tone control ± 8 dB at 50, 100 Hz (150, 300 Hz)
Treble control ± 8 dB at 10.20 kHz (3.6 kHz)
Filtro subsonico 15 Hz 6 dB/oct
Muting -20 dB