Pioneer A-858

Short description

Amplifier derived from the A-757 (and thus from the A-717) with even larger transformers and even more power in an oversized cabinet, successor of the A-88X, very similar to the analog section of the A-90D/A-91D. However, only introduced at the same time as the A-757 and A-656, therefore smaller knobs already made of plastic and plugged instead of screwed.

Data

General

  • Manufacturer: Pioneer
  • Model: A-858
  • Type: Integrated amplifier
  • Years of manufacture: 1989 - 1991
  • Made in: Japan
  • Color: Black
  • Power consumption: 1000W (max)
  • Dimensions: 420 x 172 x 474 mm (WxHxD)
  • Weight: 24,5 kg
  • Original price approx.: 1'500 DM


Connections

  • Number of inputs: 8
    • Phono
    • Tuner

CD/DVD

    • Line/Aux
    • Tape-1/DAT
    • Tape-2
    • Tape-3
    • Adaptor In-Out / Pre-Out

Number of outputs:

    • list the outputs here (with level/impedance).


Technical Data

  • Continuous power (with distortion factor)
    • 8 Ohm: 2 x 105 W / 0,03%
    • 4 Ohm: 2 x 160 W / 0,05%
  • Dynamic power
    • 4 Ohm: 2 x 230 W
    • 2 Ohm: 2 x 350 W
  • Total harmonic distortion: 0.03%
  • Attenuation factor 1kHz/20Hz ~ 20kHz, 8 Ohm: 200/70
  • Bandwidth power 0,05%, 8 Ohm: 5 - 60.000 Hz
  • Signal-to-noise ratio phono MM: 74dB
  • Signal-to-noise ratio CD, Tuner, Line, Tape: 92dB
  • Stereo channel separation:
  • Tone control:
    • Bass: +-8dB (100Hz)

Treble: +-8dB (10kHz)

  • Loudness: Yes, Volume button -40dB position +5dB(100Hz) +3dB(10kHz).
  • High Filter:
  • Low Filter (Subsonic): Yes, key 17Hz (12db/oct.)
  • Mute: Yes, button
  • Direct/Line-Straight: Yes


Special Features

  • Elaborate and solid workmanship
  • Extremely high output power (immense current stability)
  • Adapter loop (through bridge plug on the back)
  • Direct switch: for direct connection to the volume control
  • Phono switch for MM and MC cartridges + subsonic
  • Transformers in solid cast housings to protect against resonance and magnetic interference
  • Honeycomb-ribbed chassis and honeycomb-structured heat sink (resonance and vibration damping)
  • Robust power supply for stable supply during peak loads
  • Spatially separated stages, therefore elimination of mutual interference
  • Gold-plated connectors for phono and CD


Remarks




Pictures

  • [[Image: Pioneer A-858

Pioneer A858.jpg


Reports

Links