Royal-T Hearing Aid

Zenith Radio Corp.; Chicago, IL

  • Year
  • 1953
  • Category
  • Medical Technology
  • Radiomuseum.org ID
  • 73940
    • alternative name: Chicago Radio Lab

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

 Technical Specifications

  • Number of Transistors
  • 3
  • Main principle
  • Audio-Amplification
  • Wave bands
  • - without
  • Details
  • Hearing aid
  • Power type and voltage
  • Dry Batteries / 1.5 Volt
  • Loudspeaker
  • - only for Earphone!
  • Material
  • Metal case
  • from Radiomuseum.org
  • Model: Royal-T Hearing Aid - Zenith Radio Corp.; Chicago,
  • Shape
  • Very small Portable or Pocket-Set (Handheld) < 8 inch.
  • Notes
  • Worlds first transistorised hearing aid, introduced Oct.1953; a single 1.5Volt "N" cell allowed operation for ca 15 cents a month, while comparable tube models operated at $4.50 to $9.00 a month. The following year 1954 brought already five successive transistorised models;

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The model Royal-T is part of the collections of the following members.

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