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. |  | Click picture for larger view | | |   | | | |
| 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". |  | Click picture for larger view | | | |
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). |  | Click picture for larger view | | | |
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. |  | Click picture for larger view | | | |
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. |  | Click picture for larger view | | | |
| 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. |  | Click picture for larger view | | | |
| Side view of the Sonotone Model 35:12 carbon hearing aid receiver with earmold attached. |  | Click picture for larger view | | | |
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. |  | Click picture for larger view | | | |
| 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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