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

Sonotone Model 400 Eyeglass Hearing Aids

Sonotone Model 400 eyeglass hearing aids were manufactured by Sonotone International, Inc., of Ossining, New York beginning in September 1957.

This was a 4-transistor hearing aid amplifier. It also had automatic gain control (AGC).

The Model 400 was all contained in one temple piece. Thus a person could now wear two hearing aids—one in each temple piece as with the example shown here. With hearing aids in each temple piece, the whole eyeglass assembly only weighed 4 oz. without the batteries.

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Side view of the Sonotone Model 400 eyeglass hearing aid. As was common during the late 1950s, the temple pieces were thick and heavy-looking. Even so, this was quite an attractive pair of eyeglasses.


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Inside view of the temple piece showing the Sonotone name and model number.

The ear mold tube slide over a short stub at the bottom of the temple piece.


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Outside view of the Sonotone Model 400 eyeglass hearing aid showing the microphone port facing out to the side.

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Bottom view of the Sonotone Model 400 eyeglass hearing aid showing the volume control wheel (right).

 

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View of the back of the Sonotone Model 400 eyeglass hearing aid showing how the battery door swung out and down to open (left), and the  on/off switch (top right).

This hearing aid took a No. 675 battery.

 


 

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