Stereo Amplifier & Control Unit 421

Armstrong Audio / Wireless & Television / Manufacturing; London

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  • Year
  • 1967–1969
  • Category
  • Audio Amplifier or -mixer
  • Radiomuseum.org ID
  • 345195

 Technical Specifications

  • Number of Transistors
  • Semiconductors present.
  • Semiconductors
  • Main principle
  • Audio-Amplification
  • Wave bands
  • - without
  • Power type and voltage
  • Alternating Current supply (AC) / 110/120/220/240 Volt
  • Loudspeaker
  • - This model requires external speaker(s).
  • Power out
  • 30 W (undistorted)
  • Material
  • Metal case
  • from Radiomuseum.org
  • Model: Stereo Amplifier & Control Unit 421 - Armstrong Audio / Wireless &
  • Shape
  • Book-shelf unit.
  • Dimensions (WHD)
  • 269 x 102 x 267 mm / 10.6 x 4 x 10.5 inch
  • Notes

  • Stereo Amplifier & Control Unit

    Specifications:

    RMS Output Power 15 W per channel 4 -16 Ω
    Frequency Response 20- 20,000 Hz, ±1 dB
    THD < 0.5% at 1 kHz @ 15 W
    Bass Control ±10 dB @ 70 Hz
    Treble Control ±10 dB @ 10 kHz

    Quasi Complementary Transistor Output stage with AL102 Germanium transistors.

    Addendum : Extremely likely that the diagram of the electrical circuit is absolutely identical to the model "521", with pilot stages of the final stages (with power transistors AL102) in variant "A.14" therefore, using mostly germanium transistor drivers.

  • Net weight (2.2 lb = 1 kg)
  • 5.7 kg / 12 lb 8.9 oz (12.555 lb)
  • Author
  • Model page created by Stefano Ricupero. See "Data change" for further contributors.

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