Pioneer QX-747 A

Data

General

  • Manufacturer: Pioneer
  • Model: QX-747 A

Type: Quadraphonic Receiver

  • Years of manufacture: 1976 - 1977
  • Made in: Japan
  • Color: silver, wooden case walnut
  • Power consumption: 340 watts
  • Dimensions: 550 x 160 x 420 mm (WxHxD)
  • Weight: 19.1 kg
  • Original price approx.: 2'400 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 Full Logic

    • 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



Pictures

  • Image: Pioneer QX-747 A

QX747A.jpg


Reviews

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


Links

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