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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General Info

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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.

Body Type Transistor Hearing Aids

Omikron Model 111

The Omikron Model 111 transistor hearing aid was manufactured by Micro-Electric Ltd. of Zurich, Switzerland in 1957.

Controls include a volume control on the top left corner, and a four-position on-off/tone control lever on the top right corner. To turn the aid on, you flip the lever to one of the three tone positions—I, II or III.

This hearing aid contains a t-coil. The two-position sliding switch on the right side is labeled "M" (microphone) and "T" (t-coil).

This hearing aid is 2¼" x 1⅜" x ⅝" thick.

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The battery compartment of the Omikron Model 111. It used a 1.4 volt "401" size mercury battery (shown).

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This is the Omikron Model 111 in its original box.

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