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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