• Country
• United States of America (USA)

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

• Year
• 1947 ??

• Category
• Medical Technology

• Radiomuseum.org ID
• 171292

• • alternative name: Chicago Radio Lab

• Number of Tubes
• 3

• Valves / Tubes
• CK512AX CK512AX CK528AX

• Main principle
• Audio-Amplification; 3 AF stage(s)

• Wave bands
• - without

• Details
• Hearing aid

• Power type and voltage
• Dry Batteries / 1.5V & 30 Volt

• Loudspeaker
• - only for Earphone!

• Material
• Plastics (no bakelite or catalin)

• from Radiomuseum.org
• Model: 75 Hearing Aid - Zenith Radio Corp.; Chicago,

• Shape
• Very small Portable or Pocket-Set (Handheld) < 8 inch.

• Dimensions (WHD)
• 66 x 136 x 24 mm / 2.6 x 5.4 x 0.9 inch

• Net weight (2.2 lb = 1 kg)
• 0.150 kg / 0 lb 5.3 oz (0.33 lb)

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

• Other Models

• Here you find 4496 models, 4101 with images and 3615 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Zenith Radio Corp.; Chicago, IL