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 900  Vacuum Tube Hearing Aid

The Sonotone Model 900 vacuum tube hearing aid was manufactured by Sonotone International, Inc. of Ossining, New York in 1947.

The Sonotone Model 900 vacuum tube hearing aid used three vacuum tubes. It weighed 5.4 oz. (154 g) without the batteries, receiver or cords. It measured 4⅜" high x 2⅝" wide by 1" thick (11.1 x 6.7 x 2.6 cm).

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Front view of the Sonotone Model 900 vacuum tube hearing aid showing the  microphone grill (upper center).

This hearing aid had a metal front (rhodium finish) and a dark gray plastic chassis and back.


 

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Close-up view of the elegant microphone grill of the Sonotone Model 900 vacuum tube hearing aid showing the bronze lyre.

 

 

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Top view of the Sonotone Model 900 vacuum tube hearing aid showing the volume control wheel (left), two-pronged receiver cord plug (center) and 4-position on-off /tone control switch (right).

Probably the positions were off, high tone, medium tone and low tone.

The receiver, receiver cord and ear mold are missing.

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Left side view of the Sonotone Model 900 vacuum tube hearing aid.

 

 

 

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Rear view of the Sonotone Model 900 vacuum tube hearing aid showing the battery compartment door (lower half).

 

 

 

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Upper view of the back of the Sonotone Model 900 vacuum tube hearing aid showing the two slots into which the pocket clip snapped (missing).
 

 

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Rear view of the Sonotone Model 900 vacuum tube hearing aid showing the "nameplate" in the center of the back.

It shows where made (Made in U.S.A.), the manufacturer (Sonotone), the model number (900) and below that the serial number (933030).

 

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Rear view of the Sonotone Model 900 vacuum tube hearing aid showing the battery compartment door opened and the empty battery compartment.

 

 

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Close-up view of the inside of the battery compartment lid of the Sonotone Model 900 vacuum tube hearing aid showing the instructions for inserting the batteries properly in ensure their correct polarity.

 

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Close-up view of the battery compartment of the Sonotone Model 900 vacuum tube hearing aid showing the 1˝ volt "A" battery (above) and the 22˝ volt "B" battery (below).

The "A" battery was an Eveready No. 1015E (or equivalent) and the "B" battery was an Eveready No. 412E (or equivalent).

 

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Bottom view of the Sonotone Model 900 vacuum tube hearing aid showing the 2-pronged jack for plugging in an external "A" battery. Note the holes are of different sizes so you couldn't plug the "A" battery in the wrong way.

 

 


 

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