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

Otarion L20 "Listener"

The Otarion L20 "Listener" eyeglass hearing aid was manufactured by Otarion Electronics, Inc. of Chicago, IL. They came out in January, 1956.

The Model L20, like the Model L10, needed both temple pieces to house all the electronics. Thus it could only aid one ear, in this case, the left ear.

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Back

 
The Otarion L20 "Listener" still had thick temple pieces, but from the front it did not look as "heavy" as the previous model did.

It came in brown and black (brown shown here).

 

 

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A pair of black Otarion L20 "Listener" eyeglass hearing aids.

 

 

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Folded view of the  Otarion L20 "Listener". The microphone port was located on the side of the right temple piece ahead of the ear (black hole near center of picture).

 

 

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The large volume control knob on the Otarion L20 "Listener" was on the side near the end of the right temple piece, behind the right ear.

 

 

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View of the inside of the right temple piece of the  Otarion L20 "Listener" showing the model ("Listener"), the manufacturer (Otarion) and its location (Dobbs Ferry, NY).

Note that the designation "Listener" was used for most of the Otarion eyeglass models from 1954 until about 1961.

 

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The serial number of the Otarion L20 "Listener" was located on the inside of the right temple piece following the name and model information (shown above).

 

 

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The battery compartment door on the Otarion L20 "Listener" was at the top rear of the left temple piece.

 

 

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The battery compartment door swung up from the end to reveal the battery.

 

 

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The opened battery compartment on the Otarion L20 "Listener" and the mercury battery it used.

The Otarion L20 "Listener" used a No. 625 battery.

 

 

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The ear mold tube attached to the "nubbin" on the underside of the left temple piece, just ahead of the ear (shown on the far right of the picture).

 

 

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Since the Otarion L20 "Listener" required both temple pieces to house all the electronics, there had to be a way to get the power and signals from one side to the other. They accomplished this by means of two wires that ran inside the frame across the top front of the glasses.

Since wires would eventually break at the hinges from all the folding (besides being conspicuous), they used two "pins" and "plate contacts" instead.

Notice the two pins sticking out of the left temple piece (top center).

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When the temple pieces were unfolded, these pins made contact with the two "plates" on the back of the frames (left).

 

 

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The Otarion L20 "Listener" hearing aid eyeglasses in their original box.

 

 

 


 

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