• Country
• United States of America (USA)

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

• Year
• 1957 ?

• Category
• Medical Technology

• Radiomuseum.org ID
• 121590

• • alternative name: Chicago Radio Lab

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

• Number of Transistors
• 4

• Semiconductors
• CK784 CK784 CK785 unknown_tr

• Main principle
• Audio-Amplification; 4 AF stage(s)

• Wave bands
• - without

• Details
• Hearing aid

• Power type and voltage
• Dry Batteries / 1.5 Volt

• Loudspeaker
• - only for Earphone!

• from Radiomuseum.org
• Model: Hearing Aid 50X4 - Zenith Radio Corp.; Chicago,

• Literature/Schematics (1)
• -- Schematic (H.G. Mende, Leitfaden der Transistortechnik, Franzis Verlag München, 1.Auflage 1959 S.217)

• Author
• Model page created by Marc Gianella. 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