• Year
  • 1947
  • Category
  • Audio Amplifier or -mixer
  • Radiomuseum.org ID
  • 128906

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

 Technical Specifications

  • Number of Tubes
  • 2
  • Main principle
  • Audio-Amplification
  • Wave bands
  • - without
  • Power type and voltage
  • AC/DC-set / 110-120 Volt
  • Loudspeaker
  • Permanent Magnet Dynamic (PDyn) Loudspeaker (moving coil) / Ø 4 inch = 10.2 cm
  • Material
  • Plastics (no bakelite or catalin)
  • from Radiomuseum.org
  • Model: Belfone 440L - Bell Sound Systems; Columbus
  • Shape
  • Tablemodel, with any shape - general.
  • Notes
  • The Bell Sound model Belfone 440L and Belfone 440S are AC-DC operated inercommunication systems. Normally a model 440L (with more station switches) and model 440S work together, sometimes also with substations with a call switch. See photo from SAMS.
  • Author
  • Model page created by Ernst Erb. See "Data change" for further contributors.

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