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.

 

Behind the Ear (BTE) Transistor Hearing Aids

Oticon Model E24V1 Behind-the-Ear Transistor Hearing Aid

The Oticon E24V1 BTE hearing aid was manufactured by Oticon A/S in Denmark in 1978.

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The upper back view of the Oticon Model E24V1 showing the directional microphone switch (top) and volume control (middle).

 

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Top view of the Oticon Model E24V1 showing a close-up of the directional microphone switch. When it is pushed forward (shown) the "DIR" appears immediately behind the switch. At the same time the microphone porthole lines up with the microphone mounted just below so sounds can reach it—thus providing directional capability.

When the switch is pushed back the directional microphone port is covered preventing this microphone from receiving any sound, thus putting the hearing aid back into conventional microphone mode.

This is the only hearing aid of which we know with this kind of mechanical switching mechanism.
 

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View of the front of the Oticon Model E24V1 showing the two programming screws. The one on the left sets the tone from low to high (L, N, H), while the one on the right sets the maximum output (gain). It ranges from 30 to 80 dB.

Notice the front microphone grill peaking out from behind the ear hook (right).


 

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View of the front of the Oticon Model E24V1 showing the battery door (bottom left). This hearing aid used a No. 675 battery.


 

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Ruler (in inches) showing size of the Oticon Model 24V1.

The two-position switch at the bottom (left) is the "M" (microphone—up—shown) and "T" (t-coil—down).


 

 

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