Radio Tel & Tel RJ-4 3 Point Tap Switch

DeForest Radio Telephone & Telegraph Co. (De Forest); New York

  • Year
  • 1913
  • Category
  • Radio module pre 1926 (not a part, not a key)
  • Radiomuseum.org ID
  • 278262
    • 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, TUBES VISIBLE.
  • from Radiomuseum.org
  • Model: Radio Tel & Tel RJ-4 [3 Point Tap Switch] - DeForest Radio Telephone &
  • Shape
  • Tablemodel, Box - most often with Lid (NOT slant panel).
  • Notes
  • This is a circa 1913 Radio Telephone & Telegraph Co. early RJ-4 which uses a 3-point tap switch left of the Audion for B-battery control. The later “Improved Type RJ-4” of the DeForest Radio Telephone & Telegraph Co. uses a 5-point tap switch. Note also that the Radio Telephone & Telegraph Co. was formed by Lee DeForest in December 1913. That company name was only used for 10 months until the name was changed to the DeForest Radio Telephone & Telegraph Co. in Oct 1914.

    The later version of the R.J.4 Audion Detector used five tap switch points to adjust the high voltage for the wing (plate).

  • Mentioned in
  • January 1914, Modern Electrics & Mechanics advertisement page 104
  • Author
  • Model page created by Richard Groshong. See "Data change" for further contributors.

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The model Radio Tel & Tel RJ-4 is part of the collections of the following members.

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The model Radio Tel & Tel RJ-4 can be seen in the following museums.

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