• Country
• United States of America (USA)

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

• Year
• 1922/1923

• Category
• Radio part (not a module) 

• Radiomuseum.org ID
• 214652

• • alternative name: Lee De Forest Mfg.

• Wave bands
• - without

• Power type and voltage
• No Power needed

• Loudspeaker
• - - No sound reproduction output.

• Material
• Various materials

• from Radiomuseum.org
• Model: F-500 Rheostat - DeForest Radio Telephone &

• Notes
• This F-500 "De Forest Rheostat" was offered for $ 1.20 in 1923 (postal stamp) by "The North American Radio & Supply Corp.", 5-7 Columbus Circle, New York City.

• Price in first year of sale
• 1.20 $

• Author
• Model page created by Ernst Erb. See "Data change" for further contributors.

• Other Models

• Here you find 158 models, 132 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