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.

 

Vacuum Tube Hearing Aids: 1921-1953

Sonotone Model 988  Vacuum Tube Hearing Aid

The Sonotone 988 was reputed to be the slimmest and lightest vacuum tube hearing aid ever manufactured. It weighed just over 3 oz. It measured 3.0" high x 1¾" wide by ⅝" thick.

The Sonotone Model 988 was manufactured by Sonotone International, Inc. of Elmsford, NY in 1952. As it happened, this was only months before the first transistorized hearing aids came out and made vacuum tube hearing aids obsolete.

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Back

 
The Sonotone 988 shown with its back taken off. It used a No. 401 mercury cell for the A battery (left), and a No. 504 15 volt battery for the B battery.


 

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The inside of the Sonotone 988 showing the front of the circuit board and the tiny tubes it used.

Incidentally, Sonotone made their own tiny vacuum tubes and miniature components.

 

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The inside of the Sonotone 988 showing the back of the circuit board.

 

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The Sonotone 988 in its original box.

 

If you are interested, read the news item on the Sonotone 988 that was printed in the New York Times on December 12, 1952.

 


 

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