Radio Tel & Tel RJ-4 3 Point Tap Switch
DeForest Radio Telephone & Telegraph Co. (De Forest); New York
- Country
- United States of America (USA)
- Manufacturer / Brand
- 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.
- Number of Tubes
- 1
- Valves / Tubes
- AUDION_DeForest
- 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.
- Other Models
-
Here you find 158 models, 132 with images and 15 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
All listed radios etc. from DeForest Radio Telephone & Telegraph Co. (De Forest); New York
Collections
The model Radio Tel & Tel RJ-4 is part of the collections of the following members.