Stereo Power Amplifier 400A Class A

Threshold Corporation; Sacramento, Camarillo (CA)

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  • Year
  • 1976–1979
  • Category
  • Audio Amplifier or -mixer
  • Radiomuseum.org ID
  • 275813

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

 Technical Specifications

  • Number of Transistors
  • Semiconductors present.
  • Main principle
  • Audio-Amplification; Hi-Fi-High End products
  • Wave bands
  • - without
  • Details
  • Hi-Fi equipment
  • Power type and voltage
  • Alternating Current supply (AC) / 120 Volt
  • Loudspeaker
  • - This model requires external speaker(s).
  • Power out
  • 200 W (1000 W max.)
  • Material
  • Metal case
  • from Radiomuseum.org
  • Model: Stereo Power Amplifier 400A Class A - Threshold Corporation;
  • Shape
  • Rack
  • Dimensions (WHD)
  • 19 x 7 x 12 inch / 483 x 178 x 305 mm
  • Notes

  • Threshold Stereo Power Amplifier Model 400A Class A

    Power output 100W/channel, both channels driven, 8 Ohm load, 20Hz-20kHz.

    THD < 0.1% at rated power, monotonously decreasing at lower power output.

    IMD < 0.1% at rated power, monotonously decreasing at lower power output.

    Harmonic distortion components dominated by second and third harmonics.

    TIM < -75 dB at 10W output, 1.5 kHz squarewave mixed with 80 kHz sine wave at -20 dB.

    Rise and fall time < 1 µs.

    Slew rate max. 50V/µs or 25A/µs.

    Loop propagation delay 20 ns.

    Output current max. > 20A/channel (pulse), 5A/channel (continuous).

    Bandwidth 0 Hz-500 kHz (+0, -4 dB).

    Input impedance 23k.

    Voltage gain 23 dB.

  • Net weight (2.2 lb = 1 kg)
  • 51.5 lb (51 lb 8 oz) / 23.381 kg
  • Mentioned in
  • -- Original-techn. papers. (Threshold Corporation 400A Data Sheet)
  • Literature/Schematics (1)
  • -- Original-techn. papers. (Threshold Corporation 400A Service Manual)
  • Author
  • Model page created by Aren van Waarde. See "Data change" for further contributors.

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