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 200 Transistor (Body) Hearing Aid

The Sonotone Model 200 transistor body hearing aid was manufactured by Sonotone Corp in 1956.

The polished aluminum case measured 3" by 1¾" by about ⅝" thick and weighed 4¾ oz with the battery.

This hearing aid had 4 transistors arranged to work in a push-pull (PP) amplifier. It also had automatic gain control (AGC).

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Front view of the Sonotone 200 hearing aid. Notice the 4-pointed gold-colored star below the microphone grill (center).

 

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Top view of the Sonotone 200 transistor hearing aid showing the volume control (left), the earpiece cord jack (center) and 3-position off-on-t-coil switch (right).

 

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Left side view of the Sonotone 200 transistor hearing aid showing the "Bi-Focal" switch (left of center). It appears this switch set the hearing aid in either regular or high-power mode.

 

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The battery compartment of the Sonotone 200 transistor hearing aid with the battery removed. The model number is on the label on the lid of the battery compartment.

 

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Close-up of the controls in the battery compartment of the Sonotone 200 transistor hearing aid. These controls are discrete-position sliding switches. On the left is the 4-position power control. In the center is the 2-position low-pass filter control. To the right is the 2-position high-pass filter control.

To set them, you put a pen in the hole in each control arm and slide the control to the position you want it.

 

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View of the battery compartment of the Sonotone 200 transistor hearing aid with a Sonotone 600 battery in place. This hearing aid also used the Eveready E122E battery.

 

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Close-up view of the receiver of the Sonotone 200 transistor hearing aid. This receiver is a bit unusual in several ways (see two pictures below also). Note that the nubbin to which the ear molds snap to is off center. The receiver is also a smaller size than most receivers of that era.

 

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Close-up view of the receiver back of the Sonotone 200 transistor hearing aid. Instead of having the receiver cord plug into it, this receiver is unusual in that the receiver cord is hard wired to the shell that fits over the back of the receiver. If the cord broke you replaced the cord and shell. Most other receivers had a jack, so when the cord broke you just replaced the cord.

The back (inside) of the receiver (left) and the shell with cord that snapped over it (right).
 

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Because the Sonotone 200 used a nubbin of smaller diameter to snap the ear mold to, ear molds made of the Sonotone 200 had to have a special metal spacer built into the ear mold to make the hole smaller.

The ear mold at the left has this special spacer to fit the Sonotone 200 receiver. The ear mold at the right has the standard sized hole used by most other hearing aids.

 

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Sonotone 200 transistor hearing aid being used with the Sonotone miniature loop pad.

 

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Sonotone 200 transistor hearing aid in its original case.

 

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Outside view of the original case of the Sonotone 200 hearing aid.

 


 

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