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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