• Country
• United States of America (USA)

• Manufacturer / Brand
• Sonotone Corporation, Elmsford, New York

• Year
• 1951

• Category
• Medical Technology

• Radiomuseum.org ID
• 241218

• Number of Tubes
• 3

• Valves / Tubes

• Main principle
• Audio-Amplification

• Wave bands
• - without

• Details
• Hearing aid

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

• Loudspeaker
• - only for Earphone!

• Material
• Metal case

• from Radiomuseum.org
• Model: Hearing Aid 977 - Sonotone Corporation, Elmsford

• Dimensions (WHD)
• 2 x 2.75 x 1 inch / 51 x 70 x 25 mm

• Notes

• Batteries are models 507E 30 volt 'B' and 6E1E 1,5 volt 'A'

• Author
• Model page created by Massimo Follaro. See "Data change" for further contributors.

• Other Models

• Here you find 7 models, 6 with images and 2 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Sonotone Corporation, Elmsford, New York