Microphone Bar Amplifier

New Wilson Electrical , London

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  • Year
  • 1926
  • Category
  • Audio Amplifier or -mixer
  • Radiomuseum.org ID
  • 184336

 Technical Specifications

  • Main principle
  • Audio-Amplification
  • Wave bands
  • - without
  • Power type and voltage
  • Dry Batteries
  • Loudspeaker
  • - This model requires external speaker(s).
  • Material
  • Bakelite case
  • from Radiomuseum.org
  • Model: Microphone Bar Amplifier - New Wilson Electrical , London
  • Shape
  • Tablemodel, with any shape - general.
  • Dimensions (WHD)
  • 93 x 125 x 93 mm / 3.7 x 4.9 x 3.7 inch
  • Notes

  • Magnetic microphone bar amplifier. Was used to amplify signals direct from a crystal set to a loudspeaker, using 1 or 2 dry batteries. Price 34/-

    The input signal is applied to two terminals and fed to the "receiving coils", which causes an iron reed to vibrate in sympathy to the changing magnetic field in the coils. The vibrations are then applied to a small carbon microphone, connected to a 3 volt battery. The amplified current is fed to the output terminals via a transformer to a loudspeaker or a set of headphones.

    This type of amplifier was invented in 1904 by Bell engineer H.E. Shreeve. Shreeve used the device to amplify telephone signals between New York and Chicago.

  • Source of data
  • - - Data from my own collection
  • Author
  • Model page created by John Koster. See "Data change" for further contributors.

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