Super Sonotone Model 33 Carbon Hearing Aid The Super Sonotone Model 33 carbon hearing aid was manufactured in 1933 by Sonotone International, Inc. of New York. This hearing aid came with either a receiver or a bone-conduction transducer. The one shown here came with a bone-conduction transducer. |  | Click picture for larger view | | |   | | | |
| Front view of the Super Sonotone Model 33 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 4.6 oz. Note the small circle with an "S" inside (center).
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Rear view of the Super Sonotone Model 33 carbon hearing aid double microphone showing the pocket clip (top center).
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Close-up rear view of the Super Sonotone Model 33 carbon hearing aid double microphone. Below the pocket clip (not shown) are the words "Sonotone Corp, New York" and just below the center, the serial number S-40211.
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| Inside view of the Super Sonotone Model 33 carbon hearing aid double microphone showing the microphone diaphragm with the date of manufacture on it—namely December 26, 1933. They used to write the date on the diaphragm when manufactured, and then each time they changed the carbon shot as it burned up. |  | Click picture for larger view | | | |
| Top side view of the Super Sonotone Model 33 carbon hearing aid double microphone showing the three-pin body plug and socket. Note that the socket is recessed into the body, not flush with the surface as was the case with later hearing aids. |  | Click picture for larger view | | | |
| Side view of the above plug showing the name "Sonotone" and below that, "New York". |  | Click picture for larger view | | | |
| Bottom side view of the Super Sonotone Model 33 carbon hearing aid double microphone showing the on-off/volume control slider (shown in the off position), and the "foot" swung out so it could stand on a table. |  | Click picture for larger view | | | |
| End view of the Super Sonotone Model 33 carbon hearing aid carbon amplifier showing the 3-pin plug and socket. This plug is slightly smaller than the body plug so you can't accidentally interchange them. |  | Click picture for larger view | | | |
| Side view of the Super Sonotone Model 33 carbon hearing aid carbon amplifier showing the name "Sonotone", "New York" and "US. Patent 1,939,627". The two pins on the bottom of the carbon amplifier plugged directly into a battery such as the Sonotone Model X42 3-volt battery. |  | Click picture for larger view | | | |
View of the Super Sonotone Model 33 carbon hearing aid bone conductor transducer showing the end of the transducer with the cable plugs and transducer jacks. The plugs are different sizes so can only plug in the "right" way.
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| View of the back of the Super Sonotone Model 33 carbon hearing aid bone conductor transducer showing the pattern on its back. |  | Click picture for larger view | | | |
| View of the Super Sonotone Model 33 carbon hearing aid bone conductor transducer and headband. The headband held the transducer tightly to the mastoid bone behind the ear for efficient transfer of the sound vibrations to the skull.
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