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 SRD Carbon Hearing Aid

 The Acousticon model SRD was a dual microphone carbon hearing aid manufactured between 1910 and 1928 by the General Acoustic Company, which later became Dictograph Products, Inc.


 

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Front view of the Acousticon SRD showing the double carbon microphone. Note that the microphone grill consists of 8 slots for each microphone.

This carbon microphone measured 5⅞" by 3⅜" by 15/16" thick.

 

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The back of the Acousticon SRD carbon microphone. The volume control is to the left.

 

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Close-up of the back of the Acousticon SRB carbon microphone showing the model number (SRB) (upper left) and the pocket clip (center).

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Close-up of the 6-step volume control. Soft is to the left and loud to the right.
 
 

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Bottom view of the Acousticon Model SRD microphone showing the battery plugs (left) and the battery jacks on the bottom of the carbon microphone.

The microphone plugs and jacks are all the same size no can be plugged in either way.

 

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The Acousticon Model SRD 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 an Acousticon No. 5 Hearing Aid battery.

 

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The earphone for the Acousticon Model SRD could be hand-held. The handle snapped into two depressions on each side of the earphone.

 

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The handle extended to make it more comfortable to hold up to your ear.

 

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The Acousticon Model SRD also came with a headband that snapped into the two depressions on each side of the earphone. This made for hands-free listening.

 

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Bottom view of the Acousticon Model SRD 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 "On" and "Off" markings to the left and right of the earphone jacks respectively, and the on-off switch shown in the off position (just visible below the right earphone jack).

 

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The back of the Acousticon Model SRD earphone showing the on-off switch immediately above the earphone plugs. It is in the off position.

 

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The Acousticon Model SRD in its carrying case.

 

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The carrying case for the Acousticon Model SRD carbon hearing aid.

 


 

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