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 600 Transistor (Body) Hearing Aid

The Sonotone Model 600 transistor body hearing aid was manufactured by Sonotone Corp of Ossining, New York in 1967.

It had a stainless steel case with a gray plastic insert on the front with a stylized "S" near the top center. The case measured 2⅝" by 1⅜" by about ⅝" thick. This body aid only weighed 2½ oz without the battery.

This hearing aid had 5 transistors arranged to work in a push-pull (PP) amplifier. It also had automatic gain control (AGC).
 

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Top view of the Sonotone 600 transistor hearing aid showing the microphone grill (three columns of 5 slots each), 3-position "bi-focal"/t-coil switch (left front), 2-position on/off rocker switch (center front) and volume control (right front).

It appears the "bi-focal" switch set the hearing aid in either regular or high-power mode.

 

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Left side view of the Sonotone 600 transistor hearing aid showing the 3-pronged jack (left of center) for the receiver cord plug.

 

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Right side view of the Sonotone 600 transistor hearing aid showing the inset sliding control—perhaps a tone control? You use the tip of a pen or pencil to adjust the setting.

 

 

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View of battery compartment of the Sonotone 600 transistor hearing aid. It took one No. 401 ("N") battery.

The inside of the battery cover shows the model number and the legend for the 5 tiny controls lying immediately above the battery.

 These controls are discrete-position sliding switches. On the left is the 2-position "LO" low-pass filter control labeled "2", "1". The second 2-position "LVL" control is label "H", "M". The center 2-position "HI" high-pass filter control is labeled "B", "A". The fourth 2-position "AVC" control (automatic volume control) is labeled "T", "U". On the right is the 3-position "POWER" control labeled "P", "R", "S".

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

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