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 (Body) Hearing Aids

Sonotone Model 1111 Transistor (Body) Hearing Aid

The Sonotone Model 1111 transistor body hearing aid was made by Sonotone Corporation of Elmsford, NY in 1953. This 3-transistor aid was Sonotone's first all-transistor hearing aid.

This body hearing aid measured 3 1/16" by 1¾" by ⅝" thick. (7.8 x 4.5 x 1.6 cm) and weighed 2.7 oz. (78 g) without the battery.

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Front view of the  Sonotone Model 1111 transistor hearing aid.

The Sonotone Model 1111 was designed based on US patent #2,789,160 by Franklin A. Gage.


 

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Close-up view of the upper front of the Sonotone Model 1111 transistor hearing aid showing the microphone grill with the Sonotone "S" in the center. Below it is the wire pocket clip.


 

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Front cover of the manual for the Sonotone Model 1111 transistor hearing aid. Read the manual for the Sonotone Model 1111 hearing aid here.

 

 

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Top view of the Sonotone Model 1111 transistor hearing aid showing volume control (left), the receiver cord jack (center) and the on-off switch (right).

 

 

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Top view of the Sonotone Model 1111 transistor hearing aid showing the receiver cord plug and jack.

Note the Sonotone "S" on the receiver cord plug.

 

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Top left corner of the Sonotone Model 1111 transistor hearing aid showing the 3-position on-off switch (Bi-focal control). Off is to the right. Full on is to the left. In the center position (shown) is what they call the "bi-focal" position. In this position you can "dim out background sounds for clearer hearing in crowded, noisy places". Probably this meant that in this position the microphone sensitivity was reduced by reducing the voltage by half. (This hearing aid used a special 2.8 volt battery.) In effect it was "half on" in the center position as opposed to their description of "full on" in the left position.
 

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Left side view of the Sonotone Model 1111 transistor hearing aid showing the 3-pin jack (center). This jack had two uses. You could plug in an optional external microphone (what they called the "Movable Ear"), or you could plug in an external t-coil (what they called the "Telephone Pickup" accessory).

For the ladies, the external microphone could be camouflaged by sliding one of Sonotone's "SonoCharms", a jeweled brooch, over the "Movable Ear".

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Rear view of the Sonotone Model 1111 transistor hearing aid showing the battery compartment door (lower half) in the closed position.

 

 

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View of the battery compartment of the Sonotone Model 1111 transistor hearing aid with the battery compartment door opened. It swung up from the bottom.

 

 

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Close-up view of the back of the Sonotone Model 1111 transistor hearing aid battery compartment showing the three adjustment levers.

The left one "P" was for 3 different power settings (shown here in the "2" setting), the center one "HI" (labeled B & A) was for the high cut filter (shown in the "A" position) and the right one "LO" (labeled 1 & 2) was for the low cut filter (shown in the "2" position).
 

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Close-up of the back wall of the Sonotone Model 1111 transistor hearing aid battery compartment showing the serial number (428279).

Above the serial number is stamped "See patent notice in instruction book".

Below the serial number is stamped "Sonotone Corp,. Elmsford, N.Y., U.S.A."

 

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View of the bottom of the Sonotone Model 1111 transistor hearing aid battery compartment showing the label with the Sonotone name and model number (1111) or "eleven eleven" as it was also called.

 

 

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View of the Sonotone Model 1111 transistor hearing aid battery compartment with the battery in place.

The Sonotone Model 1111 used a 2.8 volt Sonotone No. 650 (shown at right) (or No. 600 not shown) mercury battery. These were equivalent to Eveready's No. 122 (E122E) battery.

 

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Rear view of the receiver of the Sonotone Model 1111 transistor hearing aid.

 

 

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Front view of the receiver (left) of the Sonotone Model 1111 transistor hearing aid showing how it snapped to the ear mold (right), here shown unsnapped.

Note that the nubbin is off center. This was so it could be better worn in the left ear (shown), or turned 180° for the right ear. (See instruction sheet.)

 

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The Sonotone Model 1111 transistor hearing aid in its carrying case.

 

 

 

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Outside view of the carrying case of the Sonotone Model 1111 transistor hearing aid. 

The carrying case measured 5¾" x 2½" x 1⅜" (14.6 x 6.3 x 3.5 cm).

 

 

 


 

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