• Country
• Japan

• Manufacturer / Brand
• Pioneer Corporation; Tokyo

• Year
• 1987

• Category
• Audio Amplifier or -mixer

• Radiomuseum.org ID
• 285574

Click on the schematic thumbnail to request the schematic as a free document.

• Number of Transistors
• Semiconductors present.

• Semiconductors

• Main principle
• Audio-Amplification

• Wave bands
• - without

• Details
• Hi-Fi equipment

• Power type and voltage
• Alternating Current supply (AC) / 120; 220/240 Volt

• Loudspeaker
• - This model requires external speaker(s).

• Power out
• 80 W (undistorted)

• Material
• Metal case

• from Radiomuseum.org
• Model: Stereo Amplifier A-331 - Pioneer Corporation; Tokyo

• Shape
• Book-shelf unit.

• Dimensions (WHD)
• 420 x 120 x 316.5 mm / 16.5 x 4.7 x 12.5 inch

• Notes

• A hi-fi stereo integrated amplifier housed in a black or silver metal case (W Germany only) with continuous power output of 2 x 40 watts into 8 ohms. With tone controls, switches for tape monitor, loudness, speaker selection, jack for headphones, RCA phono sockets for input Phono, CD, Video/Aux, for input/output Tape1, Tape2 and terminals for 2 pairs of loudspeakers.

  Specification
  Continuous Average Power Output	40 Watts per channel min. into 8Ω from 20Hz—20,000Hz with no more than 0.02% THD
  Continuous power output (both channels driven)  20Hz—20kHz, THD 0.02%, 8Ω	40W+40W
  DIN continuous power output (both channels driven)
  1kHz, THD 1%, 8Ω  1kHz, THD 1%, 4Ω	55W+55W 72W+72W
  IEC continuous power output (both channels driven)
  63Hz—12.5kHz, THD 0.7%, 8Ω  63Hz—12.5kHz, THD 0.7%, 4Ω	53W+53W 70W+70W
  Dynamic power output (on EIA dynamic test signal)
  8Ω  4Ω  2Ω	55W+55W 90W+90W 100W+100W
  Total Harmonic Distortion (measured by Audio Spectrum Analyzer)
  20Hz—20kHz, 40W, 8Ω	0.02%
  Input sensitivity/impedance
  PHONO(MM)  CD, TUNER, VIDEO/AUX, TAPE	2.5mV/50kΩ 150mV/33kΩ
  Output level/impedance  TAPE REC	150mV/2.2kΩ
  Frequency response  PHONO (MM),  CD, TUNER, VIDEO/AUX, TAPE	20Hz—20kHz ±0.3dB 5Hz—80kHz +0dB,-3dB
  Tone control  BASS  TREBLE	±8dB (100Hz) ±8dB (10kHz)
  S/N ratio (IHF short circuit, A network)
  PHONO (MM, 5mV input)  CD (DIRECT)  CD, TUNER, VIDEO/AUX, TAPE	88dB 105dB 100dB
  S/N ratio (DIN, continuous power/50mW)
  PHONO (MM)  CD (DIRECT)  CD, TUNER, VIDEO/AUX, TAPE	73dB/60dB 86dB/63dB 86dB/60dB

  Versions/Power Requirements

  KC	Canada	120V AC 60Hz
  HE	Europe	220V, 240V AC 50/50Hz (switchable)
  HB	UK	220V, 240V AC 50/50Hz (switchable)
  HEZ	W Germany	220V, 240V AC 50/50Hz (switchable)

  Power consumption: 410W, 330VA (KC)

  Made in Japan

• Net weight (2.2 lb = 1 kg)
• 7 kg / 15 lb 6.7 oz (15.419 lb)

• Mentioned in
• - - Manufacturers Literature (1987 Hi-Fi Components catalogue)

• Literature/Schematics (2)
• - - Manufacturers Literature (Service Manual Pioneer A-331 A-331-S dated Apr 1987)

• Author
• Model page created by Edoardo Sigismondo. See "Data change" for further contributors.

• Other Models

• Here you find 1147 models, 1131 with images and 201 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Pioneer Corporation; Tokyo