Pioneer QX-747

Data

General

• 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
  • MW: 15 µV
• Frequency response: 20 - 15'000 Hz
• Distortion factor FM: stereo 0.4 %, mono 0.2 %
• Signal-to-noise ratio:
  • FM: 70 dB

AM: 50 dB

• Stereo channel separation: > 40 dB at 1 kHz
• Selectivity:
  • FM: 60 dB
  • AM: > 25 dB
• Co-wave selection: 1.0 dB
• Spurious wave selection: 65 dB
• Image frequency attenuation:
  • FM: > 80 dB

MW: > 45 dB IF attenuation:

• • FM: > 90 dB
  • MW: > 55 dB
• AM suppression: 65 dB

Special Features

• Equipped with all quadraphonic systems:
  • CD-4

SQ Decoder

• • Regular Matrix
• Quadro level meter
• Connector for Dolby adapter
• MPX 4-Channel Output Jack
• MPX Noise Filter
• FM Muting
• Bass / Tweeter control V + H separate
• Display level switchable: 0 dB, - 10 dB, - 20 dB

Remarks

• All Pioneer Quadro receivers at a glance:
  • Pioneer QX-646
  • Pioneer QX-747
  • Pioneer QX-747 A
  • Pioneer QX-949
  • Pioneer QX-949 A
  • Pioneer QX-4000
  • Pioneer QX-8000
  • Pioneer QX-8000 A
  • Pioneer QX-9900

• Introduction Kenwood 4-channel playback technology

Pictures

• Image: Pioneer QX-747

• Image: Pioneer QX-747 rear panel

• Excerpt from brochure: Pioneer QX-747

• Extract from brochure: Pioneer QX-747

• Extract from brochure: Pioneer QX-646, QX-747, QX-949

Reports

• Review of the Pioneer QX-747 by "Hifi Studio": [1]

• Report at "Hifi Museum" [=quadro]

Links

• External link Pioneer catalogue on "Hifi Archive": [2]