• Year
  • 1922 ?
  • Category
  • Radio part (not a module) 
  • Radiomuseum.org ID
  • 260686
    • alternative name: Lee De Forest Mfg.

 Technical Specifications

  • Wave bands
  • - without
  • Power type and voltage
  • No Power needed
  • Loudspeaker
  • - - No sound reproduction output.
  • Material
  • Various materials
  • from Radiomuseum.org
  • Model: AmplifyingTransformer type A 400 - DeForest Radio Telephone &
  • Dimensions (WHD)
  • 55 x 80 x 40 mm / 2.2 x 3.1 x 1.6 inch
  • Notes
  • Mentioned in 'Modern Radio Practice' by Hayward (1923) Page 214 Fig.160 shows the De Forest A 400 Amplifying transformer which is placed between the stages and consists of primary and secondary windings. In various types the ratio of turns varies from 3 to 1 up to 9 to 1.

  • Mentioned in
  • -- Original-techn. papers. (Modern Radio Practice by Hayward (1923) Page 214 fig.160)
  • Author
  • Model page created by Lindsay Shepherd. See "Data change" for further contributors.

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The model AmplifyingTransformer type A 400 is part of the collections of the following members.

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