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

Beltone "Invisible" Eyeglass Hearing Aid

The Beltone "Invisible" eyeglass hearing aid was made by Beltone Electronics Corporation of Chicago, IL in 1957.

The electronics required the use of both temple pieces. This hearing aid was a bone conduction hearing aid, thus it didn't require an ear mold—hence the name "Invisible".

The Beltone "Invisible" was a 3-transistor aid.

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View of the bottom of the left temple piece of the Beltone "Invisible" showing the volume control/on-off switch (midway along the bottom of the temple piece).

The serial number is visible in the top left corner.

 

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View of the behind-the-ear portion of the left temple piece of the Beltone "Invisible" showing the microphone port (large black hole near the tip).

 

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Inside view of the right temple piece of the Beltone "Invisible". The bone conductor transducer was held snuggly against the inside of the case by the two brass screws (upper right).

Notice the wire (lower left) showing how one conductor came around the corner from the eyeglass frame and connected to the temple piece via a screw. The other conductor was soldered to the metal hinge.

 

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View of the inside of the left temple piece of the Beltone "Invisible" showing the metal battery door. This hearing aid used a No. 630 battery.
 

 

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Rear view of the eyeglass part of the Beltone "Invisible" showing the wires (across the top of the frames) connecting the electronics in the two temple pieces to each other.

 

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The Beltone "Invisible" had rather ornate temple pieces.

 

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The Beltone "Invisible" showing the two temple pieces in the open position.

 

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The Beltone "Invisible" in its original case.

 

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Outside view of the case of the Beltone "Invisible".

 


 

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