March 5, 2007

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Tiny Tube for Hearing Aids (Feb, 1947)

Filed under: Ahead of its time, Origins — @ 9:43 am
Source: Popular Science ( More articles from this issue )
Issue: Feb, 1947
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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.

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