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.

 

Body Type Transistor Hearing Aids

Maico Model DJ "Commodore" Transistor (Body) Hearing Aid

The Maico Model DJ was manufactured by Maico Electronics, Inc. of Minneapolis, MN in 1975.  The name "Maico" was derived from the initials of the Medical Acoustic Instrument Company.

The Model DJ used an integrated circuit, rather than discrete transistors.  The case was stainless steel . It measured 2½" x 1¾" x ⅝" thick.

The cord and receiver (earpiece) are shown to the right. An ear mold (not shown) needs to be snapped to the receiver.
 

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Top view of the Model DJ showing the volume control (right) and 3 position tone ("N", "1" & "2") control (left). The jack (2 holes) in  the center is where you plugged in the receiver (earpiece) cord. The microphone is between the jack and the volume control. In front of the jack is a small  lever for activating the T-coil. It has three positions—"M" (microphone), "TM" (both microphone and t-coil), and "T" (t-coil only).

Notice that the microphone was located on the top, not on the front as was more commonly done with body aids.

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The Maico Model DJ used a 1½ volt Number 1015 (AA) battery.

Note that there were internal "screwdriver" controls for adjusting the tone, compression and power output (5 positions each) that were accessed from inside the hearing aid to the left of the battery.

 

 

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