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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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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