On-line Hearing Aid Museum

Hearing Aids of all types—Ear Trumpets, Carbon Hearing Aids, Vacuum Tube Hearing Aids, Transistor Hearing Aids, Body Hearing Aids, Eyeglass Hearing Aids and much more!

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General Info

Non-Electric

Carbon

Vacuum Tube

Transistor (Body)

Transistor (Ear)

Miscellaneous

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Click on the "General Information" button (top button above) for an overview and general information on this category of hearing aid.

Hearing Aid Batteries

General EP-728 Hearing Aid "A" Battery

The General EP-728 1½ volt "A" battery was used in 2-piece vacuum tube aids in the 1940s. It was often paired with an EP-901 22½ volt "B" battery which was of similar shape and size.

This battery was manufactured by the General Dry Battery Co. It weighed 3¾ oz., and measured 3 7/8" in height by 1 1/8" in diameter.

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The top view showing the 2-pin battery socket.

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