Popular Science
Issue: Feb, 1947
Posted in: Ahead of its time, Origins
Posted: 03/05/2007
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Tiny Tube for Hearing Aids (Feb, 1947)

This tube is about the same size as an entire modern hearing aid.

Tiny Tube for Hearing Aids

Only 3/4-inch long and 3/8-inch wide, tubes like this powered such war devices as walkie-talkies and mine detectors. Now their maker, Sonotone, is using them in hearing devices. Three of them go into Sonotone’s latest instrument, which can be used for either low- or high-powered amplification.

Related posts:

  1. Could you get a better job with BETTER HEARING? (Nov, 1946)
  2. Hearing Aid for Cat (Oct, 1948)
  3. Builds Giant Television Tube (Apr, 1938)
  4. Machine Reproducing Storm Crashes to Restore Hearing (Dec, 1932)
  5. Atomic Force Measured In Giant Electronic Test Tube (Jun, 1936)
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