• Year
  • 1914
  • Category
  • Radio module pre 1926 (not a part, not a key)
  • Radiomuseum.org ID
  • 99514
    • alternative name: Lee De Forest Mfg.

 Technical Specifications

  • Number of Tubes
  • 1
  • Main principle
  • Detector with Vacuum Tube (Valve), no tuner
  • Wave bands
  • - without
  • Power type and voltage
  • Storage and/or dry batteries
  • Loudspeaker
  • - For headphones or amp.
  • Material
  • Wooden case
  • from Radiomuseum.org
  • Model: R.J.4 - DeForest Radio Telephone &
  • Shape
  • Tablemodel, Box - most often with Lid (NOT slant panel).
  • Notes
  • DeForest R.J.4.;
    Polished mahogany, five contact points for high voltage adjustment, porcelain base rheostat.
    With De Forest spherical audion detector. It was the first commercial radio made with a triode tube in the US.
  • Mentioned in
  • Murdock Apparatus Catalogue No.14 (~1913)
  • Author
  • Model page created by John Koster. See "Data change" for further contributors.

 Collections | Museums | Literature

Collections

The model R.J.4 (RJ4) is part of the collections of the following members.

 Forum