Manufacturer: Pioneer
Model: QX-747
Type: Quadraphonic Receiver

Years of manufacture: 1973 - 1976
Made in: Japan
Color: silver, wooden case walnut
Power consumption: 340 watts
Dimensions: 550 x 160 x 420 mm
Weight: 19,1 Kg
Original price approx.: 650 US-$, 2'765 DM

Connections:

Number of inputs:
Phono: 2.2 mV, 50 kOhm.
Phono ground connection: yes
AUX: 140 mV, 100 kOhm
Tape: 140 mV, 100 kOhm

Coaxial FM- antenna connection (75 Ohm)
AM antenna connection (300 Ohm)
Number of outputs:
3 x loudspeaker pairs: 2 x front, 1 x rear
2 x headphone output front + rear: 6.3 mm jack each

Technical data:

Amplifier:

continuous power: quadrophonic, 20-20 kHz
8 Ohm: 4 x 20 Watt
4 Ohm: 4 x 25 Watt

music power: quadrophonic, 20-20 kHz
8 Ohm: 4 x 30 Watt
4 Ohm: 4 x 35 Watt
Continuous power: Stereo, 20- 20 kHz
8 Ohm: 2 x 40 Watt
4 Ohm: 2 x 50 Watt
Continuous power: Stereo, 1 kHz
8 Ohm: 45 Watt
4 Ohm: 55 Watt
Total harmonic distortion: 0.5 % at 20- 20'000 Hz, 0.005 % at 1 Watt, 8 Ohm
Attenuation factor: 35 at 8 ohms, 1 kHz
Frequency response:
AUX, Tape: 10 - 25'000 Hz + 0,5 dB, - 1 dB
Phono: 30 - 15'000 Hz ± 1 dB
Power bandwidth: 7 - 40'000 Hz
Signal-to-noise ratio:
Phono: 70 dB
Line: 90 dB

Tone control: yes
Bass: ± 10 dB, 100 Hz
treble: ± 10 dB, 10 kHz

Loudness: yes
High Filter: no
Low Filter (Subsonic): no

CD-4 demodulator part:

Input sensitivity: 2.5 mV
Input impedance: 100 kOhm
Distortion factor: 0,07
Signal-to-noise ratio: > 70 dB
Channel separation at 1 kHz:
Left to Right: 50 dB
front to rear: 30 dB

Frequency range: 20 - 15'000 Hz

Tuner:

Reception: FM, AM
Frequencies:
FM: 88 - 108 MHz
MW: 535 - 1600 kHz
Input sensitivity:
FM: 1.9 µV