• Country
• United States of America (USA)

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

• Year
• 1923

• Category
• Detector-Radio (Crystal or diode, without tubes/transistors)

• Radiomuseum.org ID
• 37082

• • alternative name: Lee De Forest Mfg.

• Number of Tubes
• 3

• Valves / Tubes

• Main principle
• Crystal or Solid State Detector with Amplifer

• Wave bands
• Broadcast only (MW).

• Power type and voltage
• Storage and/or dry batteries

• from Radiomuseum.org
• Model: Radiophone D4 [Box] - DeForest Radio Telephone &

• Notes

• more than one box

• External source of data
• Ernst Erb

• Source of data
• Radio Collector`s Guide 1921-1932

• Mentioned in
• The Radio Collector's Directory and Price Guide 1921 - 1965

• 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