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.

 

Transistor Hearing Aids: 1954-1990

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).

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Back

 

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.

 

 

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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.

 

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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.

 

 

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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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