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.

 

Eyeglass Style Transistor Hearing Aids: 1954-1990

Dahlberg Model D-11 "Optic-Ear" (Mod) Transistor Eyeglass Hearing Aid

The Dahlberg Model D-11 "Optic-Ear" eyeglass hearing aid was manufactured by Dahlberg Electronics, Inc. of Minneapolis, MN. starting in February, 1956.

All the electronics were housed in one temple piece— in this case, the right temple piece. This hearing aid had 4 transistors.

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Front view of the Dahlberg Model D-11 "Optic-Ear" eyeglass hearing aid. If you couldn't see the thick side temple pieces, this hearing aid looked just like regular eyeglasses.

 


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Seen from the back, the Dahlberg Model D-11 "Optic-Ear" eyeglass hearing aid had a large temple piece to house all the electronics.

The right temple piece housed the electronics. The left temple piece was a dummy to match the shape of the right temple piece.
 

 

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Underside view of the Dahlberg Model D-11 "Optic-Ear" eyeglass hearing aid showing the serial number (108854) stamped into the case.

 


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Outside view of the end of the Dahlberg Model D-11 "Optic-Ear" eyeglass hearing aid showing the large volume control wheel on the bottom (left) and the microphone port—the black hole  (center).


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View of the back of the right temple piece of the Dahlberg Model D-11 "Optic-Ear" eyeglass hearing aid showing the closed battery compartment door (top) and the volume control (bottom right).

 


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Side view of the right temple piece of the Dahlberg Model D-11 "Optic-Ear" eyeglass hearing aid showing the thick frames used at this time.

 


 

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Close-up view of the Dahlberg Model D-11 "Optic-Ear" eyeglass hearing aid showing the battery compartment door in the open position. The battery door swung up from the bottom. This hearing aid took a 675 mercury battery.


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View of the inside bottom of the right temple piece of the Dahlberg Model D-11 "Optic-Ear" eyeglass hearing aid showing the manufacturer (Dahlberg) and model (Optic-ear).



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View of the Dahlberg Model D-11 "Optic-Ear" eyeglass hearing aid showing the ear mold and tube fastened to the nubbin. This was for the right ear.


 

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The Dahlberg Model D-11 "Optic-Ear" eyeglass hearing aid in its carrying case.
 

 

 

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The case the Dahlberg Model D-11 "Optic-Ear" eyeglass hearing aid came in.

 

 

 


 

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