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.


Body Type Transistor Hearing Aids

Dahlberg D-5 "Blue Cross" (BC5) Hearing Aid

The Dahlberg D-5 "Blue Cross" (also known as the Model BC5) transistor hearing aid was produced by Dahlberg Electronics, Inc. of Minneapolis in 1953. It used three CK718 transistors.

The D-5 "Blue Cross" was enclosed in a chrome case measuring 2½" x 1¾" by ⅞". It weighed 6½ oz. with its RM-1 mercury battery.


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A single 1.4 Volt RM-1 mercury battery powered this hearing aid. This picture shows the back opened revealing the battery compartment (bottom left).




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