D7A

• Country
• United States of America (USA)

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

• Year
• 1923

• Category
• Broadcast Receiver - or past WW2 Tuner

• Radiomuseum.org ID
• 121720

• • alternative name: Lee De Forest Mfg.

• Picture
• Schematics

Previous Next

Previous Next

Click on the schematic thumbnail to request the schematic as a free document.

• Number of Tubes
• 3

• Valves / Tubes
• DV6A DV6A DV6A

• Main principle
• TRF (Tuned-Radio-Frequency but use of regeneration unknown); Reflex

• Wave bands
• Broadcast only (MW).

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

• Loudspeaker
• - For headphones or amp.

• Material
• Wooden case

• from Radiomuseum.org
• Model: D7A - DeForest Radio Telephone &

• Shape
• Tablemodel, Box - most often with Lid (NOT slant panel).

• Notes
• Plug-in loop on cabinet top. Improved version of D-7, modified to take DV6A's, when the DV1 din't work as planned. Shielding, vernier condenser, two knobs, two filament controls, built-in cat whisker.

• Source of data
• -- Collector info (Sammler)

• Mentioned in
• Radio Manufacturers of the 1920s, Vol 1 (p.168, 175)

• Author
• Model page created by a member from A. 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