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

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 output stage.

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.

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The "A" battery was a 1.4 volt mercury RM-1, while the "B" battery was a 15 volt model 504E.

The "A" battery fit in the bottom left, with the "B" battery fit beside it (bottom center).

 


 

Click picture for larger view

 

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