• Country
• United States of America (USA)

• Manufacturer / Brand
• General Radio Company; Cambridge (MA)

• Year
• 1921

• Category
• Radio part (not a module) 

• Radiomuseum.org ID
• 220734

• • alternative name: GenRad

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

• Wave bands
• - without

• Power type and voltage
• No Power needed

• Loudspeaker
• - - No sound reproduction output.

• Material
• Various materials

• from Radiomuseum.org
• Model: AF Transformer 231-A - General Radio Company;

• Notes
• AF Transformer 231-A. Turns ratio 3.7 to 1. Impedance ratio 10 to 1.

• Price in first year of sale
• 5.00 USD

• Mentioned in
• Radio Broadcast, Jun. 1924, p. 177

• Author
• Model page created by Hans-Joachim Korn † 16.11.15. See "Data change" for further contributors.

• Other Models

• Here you find 238 models, 212 with images and 128 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from General Radio Company; Cambridge (MA)