Microphone Amplifier Type C

Brown S. G. Ltd.; London

  • Year
  • 1923–1925 ??
  • Category
  • Audio Amplifier or -mixer
  • Radiomuseum.org ID
  • 69132

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

 Technical Specifications

  • Main principle
  • 1 AF stage(s)
  • Power type and voltage
  • Dry Batteries / 6 Volt
  • Loudspeaker
  • - For headphones or amp.
  • Material
  • Wooden case
  • from Radiomuseum.org
  • Model: Microphone Amplifier Type C - Brown S. G. Ltd.; London
  • Shape
  • Tablemodel, with any shape - general.
  • Dimensions (WHD)
  • 6.4 x 4.8 x 3.6 inch / 163 x 122 x 91 mm
  • Notes
  • To drive several pairs of headphones from a Crystal receiver;
    Mechanical amplifier: Magnet system driving a carbon microphone; gain ca. 6dB;
    Current consumption ca. 50 mA at 6 V.
    Two versions:
    input 4000 ohms, output 2000 ohms;
    input 4000 ohms, output 120 ohms.
  • External source of data
  • Konrad Birkner

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