Audiotone Model B-237-1 Transistor Eyeglass Hearing Aid
The Audiotone Model B-237-1 eyeglass hearing aid was manufactured by Audiotone,
Inc. of Phoenix, AZ in 1980.
It was rather unusual for its time in that instead of having all the
electronics in one temple-piece, it had the microphone in the other
temple-piece to reduce feedback when used as an high-powered aid.
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Front view of the Audiotone Model B-237-1 eyeglass hearing aid. The hearing aid
electronics are in the right temple-piece and the microphone is in the
left temple-piece.
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Right side view of the Audiotone Model B-237-1 eyeglass hearing aid
showing the thickness of the temple-pieces.
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Underside view of the right temple-piece of the Audiotone Model B-237-1
eyeglass hearing aid showing the serial number (85112) between the ear
mold nubbin (left) and the volume control (right).
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Inside view of the right temple piece of the Audiotone Model B-237-1
eyeglass hearing aid showing the two screwdriver-adjustable controls.
On the left is a recessed
screwdriver-accessible control labeled RESP for adjusting the tone.
High-frequency emphasis (H) is to the left, normal emphasis (N) is
at the top and low-frequency emphasis (L) is to the right.
On the right is the automatic gain control (AGC) adjusting screw. The
range of AGC seems to be between 60 and 75 dB.
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Bottom view of the left temple piece of the Audiotone Model B-237-1
eyeglass hearing aid showing the downward-facing microphone port (left)
close to the front of the glasses.
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Close-up view of the hinge of the left temple-piece of the Audiotone
Model B-237-1 eyeglass hearing aid showing the two-conductor cable from the microphone
going to the right temple-piece. There were two tiny wires
(copper-colored and green) in the cable.
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Close-up view of the hinge of the right temple-piece of the Audiotone
Model B-237-1 eyeglass hearing aid showing the wire coming from the microphone
in the other temple-piece.
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Close up rear view of the nose bridge of the glasses of the Audiotone Model
B-237-1 eyeglass hearing aid showing the wire embedded in the plastic
eyeglass frames going from the left to the right temple-piece .
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Rear view of the Audiotone Model B-237-1 eyeglass hearing aid.
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Close-up view of the back of the right temple piece of the Audiotone
Model B-237-1 eyeglass hearing aid showing presumably the on-off switch
(near top) and the front of the battery compartment door (bottom). The
battery compartment door swung down from the top.
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Inside view of the end of the right temple-piece of the Audiotone Model
B-237-1 eyeglass hearing aid showing the name (Audiotone), the model
number (B-237-1) and the location where
this hearing aid was made (Phoenix, Arizona, USA). Note the "bump" on
the bottom near the right side. To open the battery compartment, you
pushed this "bump" in.
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Close-up view of the tip of the right temple-piece of the Audiotone
Model B-237-1 eyeglass hearing aid showing the battery compartment door
ajar from pushing in the "bump" in the above picture. You then used your
thumb-nail to pull the battery compartment door all the way open. |
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Close-up view of the tip of the right temple piece of the Audiotone Model
B-237-1 eyeglass hearing aid showing the partially-opened battery
compartment door and how it swung down from the top. |
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Close-up view of the back end of the right temple piece of the Audiotone Model
B-237-1 eyeglass hearing aid showing the battery compartment door fully
opened revealing the battery compartment. |
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Close-up inside view of the bottom of the right temple piece of the Audiotone Model
B-237-1 eyeglass hearing aid showing a No. 675 zinc-air battery in place
in the battery compartment door. This hearing aid could use either a
No. 675 zinc-air battery (shown) or a
No. 675 mercury battery (starting to be phased out at this time). |
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Close-up view of the end of the left temple piece of the Audiotone
Model B-237-1 eyeglass hearing aid showing a "dummy" battery compartment
for carrying a spare battery.
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