Acousticon Model 28 (Silver Seal Symphonic) Carbon Hearing Aid
The Acousticon model 28 was manufactured by the General Acoustic Company,
which later became Dictograph Products, Inc. of New York, NY.
Since the model 28 came out around Acousticon's 25th anniversary in 1928,
it was also called the "Silver Seal Symphonic" or "Silver Anniversary". In honor of this, the
microphone and volume control were inlaid with a fancy pattern.
The model 28 was manufactured between 1927 and 1932. It replaced the
Acousticon model SRB. |
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Front view of the Acousticon Model 28 showing the intricate pattern
on the double carbon microphone.
Note that the microphone grill consists of 6 slots for each microphone.
This carbon microphone measured 5 3/16" by 3⅛" by 15/16" thick.
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The back of the Acousticon Model 28 carbon microphone. The pocket
clip is at the top. |
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Close-up of the bottom left side of the Acousticon Model 28 carbon microphone showing the
model number (28). |
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Close-up of the bottom right side of the Acousticon Model 28 carbon microphone showing
the battery plugs (left) and the battery jacks on the bottom of the
carbon microphone, and the serial number (right).
The microphone
plugs and jacks are all the same size so can be plugged in either way.
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The Acousticon Model 28 used a 3-volt carbon-zinc battery. The battery
cable plugged into the jacks on the top of the battery. Note the two
sizes of the plugs and jacks so you couldn't plug them in the wrong way.
The battery shown here is the large
Acousticon No.
57 Hearing Aid battery. Although the Acousticon Model 28 could use
this battery, it was designed to use a smaller battery that was the same
size as the
Acousticon No. 5 battery, but it needed jacks the same as on the
battery pictured here. |
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Close-up of the front of the Model 28 volume control. It has the
same intricate pattern on it as is on the microphone.
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The back of the Acousticon Model 28 volume control showing the on-off
switch in the off position.
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Left side view of the Acousticon Model 28 volume control showing the "L"
(loud), "M" (medium) and "S" (soft) positions. The slider (right) in the
"S" (soft) position.
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The Acousticon Model 28 came with both a receiver and an earphone. A
stock ear mold (left) attached to the receiver (right). |
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The stock ear mold (left) snapped to the receiver (right). |
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Rear view of the receiver used with the Acousticon Model 28. It measured
15/16" in diameter x
½" thick. |
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The earphone for the Acousticon Model 28. It measured 2⅛" in diameter x
¾" thick. |
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Back view of the Acousticon Model 28 earphone. |
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Bottom side view of the Acousticon Model 28 earphone showing the earphone plugs (left) and the
earphone jacks on the bottom of the earphone. The two plugs are slightly
different in size as are the two jacks so you have to plug them in the
right way. Note the groove round the periphery of the earphone. The headband
clip slid into this groove . |
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The Acousticon Model 28 came with a headband. The earphone clip slid into the
groove around the periphery of the earphone. This made for hands-free
listening. |
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Inside lid of the Acousticon Model 28 carrying case. |
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The Acousticon Model 28 in its carrying case. |
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The carrying case for the Acousticon Model 28 carbon hearing aid.
Notice the same basic pattern on the top of the lid as is on the
microphone.
The case measured 8⅛" wide x 7¾" deep by 1⅞" high.
The carrying case obviously had a carrying strap so it could be
carried over the shoulder if you so desired. Notice the metal loop
(bottom left center) to fasten the strap to. There is another loop on
the right side of the case.
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