• Country
• United States of America (USA)

• Manufacturer / Brand
• High Frequency Laboratories (HFL); Chicago, IL

• Year
• 1927

• Category
• Radio part (not a module) 

• Radiomuseum.org ID
• 217736

• Wave bands
• - without

• Power type and voltage
• No Power needed

• Loudspeaker
• - - No sound reproduction output.

• from Radiomuseum.org
• Model: R. F. Choke L-425 - High Frequency Laboratories

• Notes
• H. F. L. - R. F. Choke L-425.

• Price in first year of sale
• 6.00 $

• Mentioned in
• Radio Broadcast, Oct 1927, p. 415

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

• Other Models

• Here you find 32 models, 10 with images and 6 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from High Frequency Laboratories (HFL); Chicago, IL