• Country
• United States of America (USA)

• Manufacturer / Brand
• Zenith Radio Corp.; Chicago, IL

• Year
• 1938

• Category
• Medical Technology

• Radiomuseum.org ID
• 119935

• • alternative name: Chicago Radio Lab

• Main principle
• Audio-Amplification

• Wave bands
• - without

• Details
• Hearing aid

• Power type and voltage
• Alternating Current supply (AC) / 120 Volt

• Loudspeaker
• - only for Earphone!

• Material
• Metal case

• from Radiomuseum.org
• Model: Ravox Hearing Aid - Zenith Radio Corp.; Chicago,

• Shape
• Tablemodel, with any shape - general.

• Notes
• Non portable hearing Aid, developed from the "ear" of the Radio Nurse. Used a particularly sensitive non-directional condenser microphone and allowed manual adjustment of the amplifier to emphasize certain frequencies and pitch ranges.

• Price in first year of sale
• 29.00 $

• Source of data
• Zenith Radio The Glory Years 1936-1945

• Author
• Model page created by Konrad Birkner † 12.08.2014. See "Data change" for further contributors.

• Other Models

• Here you find 4494 models, 4099 with images and 3605 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Zenith Radio Corp.; Chicago, IL