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.

 

Carbon Hearing Aids: 1900-1939

Sonotone Model 35:12 Carbon Hearing Aid

The Sonotone Model 35:12 carbon hearing aid was manufactured in 1935 by Sonotone International, Inc. of New York.

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Front view of the Sonotone Model 35:12 carbon hearing aid double microphone showing the pattern of each of the microphone grills—12 holes in the outer ring, 6 holes in the middle ring and one hole in the center. The double microphone measured 5⅛" wide x 2½" high x ⅝" thick, and weighed 4.7 oz.

Note the small  circle with an "S" inside (center).

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Rear view of the Sonotone Model 35:12 carbon hearing aid double microphone showing the pocket clip (right).
 

 

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Close-up rear view of the Sonotone Model 35:12 carbon hearing aid double microphone. Below the pocket clip (not shown) are the words "Sonotone Corp, New York".

 

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Close-up rear view of the Sonotone Model 35:12 carbon hearing aid double microphone. About ¾ of the way down is the serial number, S-S-60866. The double S-S is likely a mistake as Sonotone normally just used an "S-" then the serial number.
 

 

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Left side view of the Sonotone Model 35:12 carbon hearing aid double microphone showing the three-pin body plug and socket.
 

 

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Right side view of the Sonotone Model 35:12 carbon hearing aid double microphone showing the on-off/volume control slider (shown in the off position).

 

 

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View of the Sonotone Model 35:12 carbon hearing aid carbon amplifier showing the three-pin plug and socket.
 

 

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Close-up view of the above plug showing its special curved shape. This prevented it from being plugged in backwards.

 

 

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Side view of the Sonotone Model 35:12 carbon hearing aid carbon amplifier showing the two pins on the bottom that plugged directly into a battery such as the Sonotone Model X42 3-volt battery.
 

 

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Bottom view of the Sonotone Model 35:12 carbon hearing aid carbon amplifier

On the bottom it reads, "Sonotone" and "Pat. Re. 19246".
 

 

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Top view of the Sonotone Model 35:12 carbon hearing aid carbon amplifier showing the three-pin socket.

This carbon amplifier was heavy for its size at 1.9 oz.

 

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View of the back of the Sonotone Model 35:12 carbon hearing aid receiver.

The pins pull out to replace the receiver cord or receiver when necessary.

 

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Side view of the Sonotone Model 35:12 carbon hearing aid receiver with earmold attached.

 

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View of the Sonotone Model 35:12 carbon hearing aid receiver and earmold showing how the pull apart.
 

 

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View of an early black custom earmold. The square end on the ear hook part (bottom right) looks definitely uncomfortable.

 

 

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The receiver of the Sonotone Model 35:12 carbon hearing aid was exceptionally thick for a receiver at ⅝". When the earmold was snapped on, the total length from the back of the receiver to the tip of th earmold was 1⅝"!

 



 

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