Batteries for Early Transistor Hearing Aids

The transition from vacuum tube to transistor hearing aids occurred in the mid 1950s.  The transistor allowed for a single power supply, and voltage as low as 1.4. Being able to operate on 1.4 volts reduced tremendously the power requirements, both in size and required voltage from that required for vacuum tube hearing aids.  Essentially…

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Vintage Hearing Aid Batteries – Shown in Use

Previous posts have talked about early vacuum tube and transistor hearing aids, and the hearing aid batteries they used.  A tremendous change occurred in hearing aid size in going from vacuum tubes to transistors as amplifiers.  Much of that related to changes in the battery size as well, as previously discussed. This post is intended…

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