• Year
  • 1921
  • Category
  • Loudspeaker, headphone or earphone
  • Radiomuseum.org ID
  • 231753
    • alternative name: Federal Recorder || Federal Tel. & Radio || Federal T&T
    • Brand: Orthosonic / Ortho-Sonic

 Technical Specifications

  • Wave bands
  • - without
  • Power type and voltage
  • No Power needed
  • Loudspeaker
  • - Is a Headphone or Earphone
  • from Radiomuseum.org
  • Model: Liberty Headphones 52-W - Federal Radio Corp. / Federal
  • Notes
  • The 52-W has 3200 Ohms, Type 53-W has 2200 Ohms. price 8 $.

  • Net weight (2.2 lb = 1 kg)
  • 2 lb 0 oz (2 lb) / 0.908 kg
  • Price in first year of sale
  • 10.50 $
  • Mentioned in
  • William B.Duck Catalog No.16, 3rd Ed.

 Collections | Museums | Literature

 Forum