Pioneer QX-747

Japan 1973

Maintenance repair

Audio
Power 4 x 20 W 8 Ohms
Power 4 x 25 W 4 Ohms
Total harmonic distortion 0.5%
Intermodulation distortion 0.5%
Power bandwidth 7 Hz - 40 kHz
Damping factor 35 to 8 Ohms
Residual noise 1 mV
Phono input sensitivity 2.2 mV 50 kOhms
Sensitivity of line inputs 140 mV 100 kOhms
Frequency response +0.5 -1 dB 10 Hz - 24 kHz
Phono input signal noise ratio 70 dB
Line input signal noise ratio 90 dB
Bass tone control ± 10 dB at 100 Hz
Treble control ± 10 dB at 10 kHz
Loudness +6 dB a 50 Hz, +3 dB a 10 kHz

FM
Sensitivity 1.9 µV
1 dB capture ratio
Selectivity 60 dB
Signal to noise ratio 70 dB
Image frequency rejection at 98 MHz 80 dB
IF rejection 100 dB
Spurious rejection 100 dB
AM suppression 55 dB
Total harmonic distortion mono 0.2%
Total stereo harmonic distortion 0.4%
Frequency response +0.2 -2 dB 20 Hz - 15 kHz
Frequency response +0.2 -0.5dB 50Hz - 10kHz
Stereo separation 40 dB
Selectivity 85 dB
Antenna 300, 75 Ohms

AM
Sensitivity against ferrite 300 µV / m
External sensitivity 15 µV
Selectivity 35 dB
Signal ratio to noise 50 dB
45 dB image frequency rejection
55 dB iF rejection