• Country
• United States of America (USA)

• Manufacturer / Brand
• Haynes-Griffin Radio Service Inc.; New York, NY

• Year
• 1925 ??

• Category
• Radio part (not a module) 

• Radiomuseum.org ID
• 239450

• Wave bands
• - without

• Power type and voltage
• No Power needed

• Loudspeaker
• - - No sound reproduction output.

• Material
• Various materials

• from Radiomuseum.org
• Model: AF Transformer 91 - Haynes-Griffin Radio Service

• Net weight (2.2 lb = 1 kg)
• 1 lb 3 oz (1.187 lb) / 0.539 kg

• Author
• Model page created by Otto Frosinn. See "Data change" for further contributors.

• Other Models

• Here you find 4 models, 4 with images and 0 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Haynes-Griffin Radio Service Inc.; New York, NY