Dahlberg D-5 "Standard" Hybrid Hearing Aid
The Dahlberg D-5 "Standard" hybrid was the first
hearing aid produced by Dahlberg Electronics, Inc. of Minneapolis using a
transistor in its circuitry. It came out in 1953.
The D-5 "Standard" hybrid used 2 CK549DX
miniature hearing aid vacuum tubes plus one CK718 transistor for the
This hearing aid’s chrome case measured 2½" by 1¾" by ⅞" and weighed 7 oz. with batteries.
The picture at the right shows the battery compartment door open.