Sonotone Model 66 Behind-the-Ear (BTE) Transistor Hearing Aid The Sonotone Model 66 behind-the-ear hearing aid was manufactured by Sonotone International, Inc. of Elmsford, NY in 1960. It was an unusual little 3-transistor hearing aid that could be worn as a BTE hearing aid, or attached to one of the temple-pieces of a pair of regular eyeglasses to form an eyeglass hearing aid. As an eyeglass hearing aid it was known as the Model 66E. The Sonotone Model 66 incorporated an AGC (automatic gain control) circuit. It measured 1¼" x 11/16" x 9/16" thick (3.2 x 1.7 x 1.4 cm). |  | Click picture for larger view | | |  | | | |
| Front view of the Sonotone Model 66 behind-the-ear hearing aid showing the anodized gold-colored aluminum case.
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| Front view of another Sonotone Model 66 behind-the-ear hearing aid. This case was black rather than gold-colored.
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| Lower front view of the Sonotone Model 66 behind-the-ear hearing aid showing the square microphone hole. The round microphone port is visible in the center of the square hole.
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| Side view Sonotone Model 66 behind-the-ear hearing aid. Note the two tiny slots near each end close to the bottom. Possibly there were for the clips to attach this hearing aid to eyeglass temple-piece. (There were two similar slots on the other side.)
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| Bottom view of the Sonotone Model 66 behind-the-ear hearing aid. Notice the star wheel of the volume control/on-off switch (upper center).
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| Rear view of the Sonotone Model 66 behind-the-ear hearing aid showing the aluminum-colored back. The battery compartment door (the second section down) opened and swung to the left.
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| Close-up view of the lower back of the Sonotone Model 66 behind-the-ear hearing aid showing the manufacturer's name (Sonotone), the Model (66) and the serial number (22154).
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| Rear view of another example of the Sonotone Model 66 behind-the-ear hearing aid also showing the above information, except that the serial number is above the Sonotone name. Also note that the serial number is larger (35611), so this black colored front model is a later version than the gold-colored front model.
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| Rear view of the Sonotone Model 66 behind-the-ear hearing aid showing how the battery compartment door swung open to the left.
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| Rear view of the Sonotone Model 66 behind-the-ear hearing aid showing the battery compartment with a battery in it. This hearing aid took a No. 675 mercury battery such as the Eveready EP675E.
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| Close-up view of the top of the Sonotone Model 66 behind-the-ear hearing aid showing the knurled nut (right) that held the ear mold tube in place by screwing the nut tighter. |  | Click picture for larger view | | | |
| Close-up view of the Sonotone Model 66 behind-the-ear hearing aid showing the pink ear mold. The ear mold was about the same size as the body of the hearing aid. This gives you a good idea of just how small this hearing aid really was. |  | Click picture for larger view | | | |
| View of the Sonotone Model 66 behind-the-ear hearing aid in its original carrying case.
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| Inside view of the lid of the Sonotone Model 66 behind-the-ear hearing aid carrying case showing the Sonotone name and logo. |  | Click picture for larger view | | | |
| Outside view of the carrying case of the View of the Sonotone Model 66 behind-the-ear hearing aid. The case measured 3¼" x 2 15/16" x 1 3/16" (8.2 x 7.5 x 3.1 cm).
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