• Country
• Great Britain (UK)

• Manufacturer / Brand
• 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.

• 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

• Source of data
• Radio! Radio!

• Author
• Model page created by Konrad Birkner † 12.08.2014. See "Data change" for further contributors.

• Other Models

• Here you find 54 models, 44 with images and 3 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Brown S. G. Ltd.; London