Hugh Hetherington Hearing Aid Museum
Hugh Hetherington Hearing Aid Museum

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


Hybrid Vacuum Tube/Transistor Hearing Aids

Acousticon Model A-300 Hybrid Hearing Aid

The Acousticon model A-300 was produced by Dictograph Products Corporation in 1953. It is a sample of the early use of a transistor in a hearing aid.

Acousticon were proud of their new transistorized hybrid and gave it a nice tortoiseshell look by using celluloid over the aluminum case with gold trim  and highlights. The unit measured 3" by 2⅜" by ⅞" and weighed 5 oz. with batteries inside.

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This hearing aid used two CK549DX miniature hearing aid vacuum tubes (upper left) with a CK718 transistor (dead center) for the output stage.

The "B" battery was a 22˝ volt model 505E (right). The "A" battery (bottom center) was a 1.4 volt mercury RM-1.



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