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.

 

Carbon Hearing Aids: 1900-1939

Acousticon Model C6 "Coronation" Carbon Hearing Aid

 The Acousticon model C6 "Coronation" was a single microphone carbon hearing aid manufactured in 1937-1939 by Dictograph Products, Inc. of  New York, NY.

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Front view of the Acousticon Model C6 "Coronation" showing the single carbon microphone.

This carbon ball (or carbon shot) microphone measured 2¾" in diameter by ⅝" thick.

The microphone was made of black Bakelite, but as it ages it often has a brown tinge to it.

 

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Rear view of the Acousticon Model C6 "Coronation" showing the pocket clip (top) hiding the model number and the logo (center).

 

 

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Close-up of the back of the Acousticon Model C8 "Coronation" carbon microphone showing the Dictograph company logo, the serial number (004549) below that, and the Model number peeking out from under the right side of the pocket clip.

 

 

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Close-up of the bottom rear of the Acousticon Model C6 "Coronation" carbon microphone showing the rather unusual on-off switch/volume control. This design worked easily for both right-handed and left-handed people. The lever could be pushed at either end (acting much like a teeter-totter) so the volume on the left showed ON, 8, 6, 4, 2, OFF while the right side showed these numbers in the reverse direction.

 

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Bottom end of the Acousticon Model C6 "Coronation" microphone (by the volume control) showing how the 3-pronged cable plugged into it.

 

 

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End view of the Acousticon Model C6 "Coronation" carbon amplifier showing the two sockets for the bone conduction transducer and battery cord plugs.

This amplifier measured 1¾" wide by 1" high by 15/16" deep. It  felt quite hefty for its size—weighing 1.3 oz.

 

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End view of the Acousticon C6 "Coronation" carbon amplifier showing the microphone (upper left) plug, and the bone conductor plug (bottom).

The microphone plug/jack had 2 pins, while the bone conductor plug/jack had two pins.

 

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End view of the Acousticon C6 "Coronation" carbon amplifier showing the microphone plug (upper), and the bone conductor plug (lower) as they looked when plugged into the carbon amplifier. Because of their shape, they could only be plugged in the correct way.

 

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Top view of the Acousticon Model C6 "Coronation" carbon amplifier showing the Acousticon name.

 

 

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Side view of the carbon amplifier of the Acousticon Model C6 "Coronation" showing the microphone and earphone plugs (left).

The plugs on the bottom plugged directly into the sockets on the top of the battery. Note that the plugs are of different sizes to preserve correct polarity.

The Acousticon Model C6 "Coronation" used a 4½ volt carbon-zinc battery such as the Model EP-129 General battery.

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Bottom view of the Acousticon C6 "Coronation" carbon amplifier.

 

 

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Top view of the bone conductor transducer of the Acousticon Model C6 "Coronation" showing the Acousticon name and the patent number (1630028).

 

 

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Side/bottom view of the Acousticon Model C6 "Coronation" bone conductor transducer. The flat bottom of the transducer was held tightly to the mastoid bone behind the ear by the headband (see below).

 

 

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The band and bone conductor transducer of the Acousticon Model C6 "Coronation" carbon hearing aid.

 

 

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Another rather unusual feature of the Acousticon Model C6 hearing aid was the larger oval "plate" for the bottom of the bone conductor transducer. It measured 2" x 1½". Possibly this larger footprint was more comfortable to wear (less pressure concentrated on one part of the mastoid bone), or the larger "footprint" transmitted a stronger bone conduction signal to the to the skull.

 

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To use the larger plate, the bone conduction transducer (left) was held  snuggly to the plate by the four upright "posts".

 

 

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Top view of the bone conductor transducer of the Acousticon Model C6 "Coronation" showing it attached to the larger "plate"

 

 

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Inside view of the case of the Acousticon Model C6 "Coronation" showing all the components neatly stowed in their places. Notice the cut-out "page" is folded back in order to stow the components.

 

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Inside view of the case of the Acousticon Model C6 "Coronation" showing the cut-out page folded forward thus securely holding the three major components in place—namely, the carbon microphone (center), the bone conductor transducer (bottom left) and the carbon amplifier (bottom right).

 

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Top view of the original case  in which the Acousticon Model C6 "Coronation" carbon hearing aid came.
 

 


 

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