• Country
• United States of America (USA)

• Manufacturer / Brand
• Frost, Herbert H.; Chicago (IL)

• Year
• 1924

• Category
• Radio part (not a module) 

• Radiomuseum.org ID
• 221909

• Wave bands
• - without

• Power type and voltage
• No Power needed

• Loudspeaker
• - - No sound reproduction output.

• Material
• Various materials

• from Radiomuseum.org
• Model: Radio Tube Control Unit - Frost, Herbert H.; Chicago IL

• Notes
• Radio Tube Control Unit. A compact device combining rheostat, vernier and potentiometer mounted as one unit, with two knob control.

• Price in first year of sale
• 2.00 USD

• Mentioned in
• Radio Broadcast, Jun. 1924, p. 186

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

• Other Models

• Here you find 21 models, 18 with images and 0 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Frost, Herbert H.; Chicago (IL)