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 700  Vacuum Tube Hearing Aid

The Sonotone Model 700 vacuum tube hearing aid was manufactured by Sonotone International, Inc. of Elmsford, New York in 1946.

The Sonotone Model 700 used three vacuum tubes. It was a two-piece unit (the batteries were external). It weighed 7.0 oz. (198 g) without the batteries and measured 3 15/16" high x 2 11/16" wide by 15/16" thick (10.0 x 6.8 x 2.4 cm).

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Front view of the Sonotone Model 700 vacuum tube hearing aid showing the microphone grill (center) and the battery plug cover (bottom).

 


 

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Left side view of the Sonotone Model 700 vacuum tube hearing aid.

 

 

 

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Top view of the Sonotone Model 700 vacuum tube hearing aid showing the volume control wheel (left), the receiver cord plugged in (center) and the 3-position on-off switch (right).

The 3-position on-off switch was something that Sonotone used. There was the "full on" position (2nd click) and the "bi-focal" position (1st click). In this position it "dimmed out"  background sounds for clearer hearing in crowded, noisy places".

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Top view of the Sonotone Model 700 vacuum tube hearing aid showing the receiver cord unplugged. Note the unusually long pins on the receiver cord plug.

 

 

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The battery cables had a unique way of plugging into the  Sonotone Model 700 vacuum tube hearing aid. First you pulled down the bottom cover. It just snaps off with a bit of a tug.

 

 

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Bottom view of the Sonotone Model 700 vacuum tube hearing aid with the bottom cover removed showing the unusual battery cable plug arrangement.

 

 

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Rather than just pulling the plug apart, your had to twist the plug 90° counterclockwise as shown. Then you could pull the plug off the center locking pin.

 

 

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Close-up view of the bottom of the Sonotone Model 700 vacuum tube hearing aid showing the battery cable plug removed from the center locking pin.

 

 

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Rear view of the back of the Sonotone Model 700 vacuum tube hearing aid showing the spring-loaded pocket clip.

 

 

 

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Close-up view of the center back of the Sonotone Model 700 vacuum tube hearing aid showing the name (Sonotone), model number (700) and serial number (884400).

To the left is the high-cut (A-B) filter shown in the "A" position.

 

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Close-up view of the  upper rear of the Sonotone Model 700 vacuum tube hearing aid showing the three-position (1 2 3) power control immediately to the right of the pocket clip. It is set to the "2" position.

 

 

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Close-up view of the unplugged  2-pronged "A" battery plug (bottom) of the Sonotone Model 700 vacuum tube hearing aid and the top of a 1½ volt Sonotone No. 800X "A" battery.

 

 

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Close-up view of the  2-pronged "A" battery plug of the Sonotone Model 700 vacuum tube hearing aid plugged into the top of the "A" battery.

 

 

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Close-up view of the unplugged 3-pronged "B" battery plug (bottom right) of the Sonotone Model 700 vacuum tube hearing aid and the top of a 45 volt Burgess No. XX30E "B" battery.

 

 

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Close-up view of the  3-pronged "B" battery plug of the Sonotone Model 700 vacuum tube hearing aid plugged into the top of the "B" battery.

 

 

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Back view of the receiver of the Sonotone Model 700 vacuum tube hearing aid. Note the Sonotone "S" on the receiver cord plug.


 

 

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Back view of the Sonotone Model 700 vacuum tube hearing aid receiver showing the receiver cord unplugged from the receiver.

 

 

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Side view of the Sonotone Model 700 vacuum tube hearing aid receiver snapped to the hard clear plastic ear mold.
 

 

 

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View showing how the ear mold snapped to the receiver. Here shown unsnapped.

This ear mold was made from an impression of the ear. See the original impression and this ear mold compared side by side.
 

 

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The Sonotone Model 700 vacuum tube hearing aid in its original leatherette carrying case.

 

 

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Outside view of the Sonotone Model 700 vacuum tube hearing aid's leatherette carrying case. The case measured 6⅝" x 4¼" x 1⅝" (16.8 x 10.4 x 4.1 cm).

 

 


 

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