• Country
• United States of America (USA)

• Manufacturer / Brand
• DeForest Radio Telephone & Telegraph Co. (De Forest); New York

• Year
• 1909

• Category
• Radio module pre 1926 (not a part, not a key)

• Radiomuseum.org ID
• 205262

• • alternative name: Lee De Forest Mfg.

• Power type and voltage
• No Power needed

• Loudspeaker
• - - No sound reproduction output.

• Material
• Various materials

• from Radiomuseum.org
• Model: R-J Variometer - DeForest Radio Telephone &

• Shape
• Chassis only or for «building in»

• Notes
• A variable tuning coil without sliding contacts, or a loose coupling using rotating coils.

• Price in first year of sale
• 16.00 $

• Mentioned in
• - - Manufacturers Literature (Ad in MODERN ELECTRICS (April 1909) p. 38)

• Literature/Schematics (2)
• Radio Manufacturers of the 1920s, Vol 1 (p161)

• Author
• Model page created by Michael Murray. See "Data change" for further contributors.

• Other Models

• Here you find 158 models, 133 with images and 16 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