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

Philco Mark I Transistor (Body) Hearing Aid

The Philco Mark I was the first of two transistor body aids made by Philco of Philadelphia, PA. The Mark I was first produced in 1955. Philco manufactured these hearing aids for Montgomery-Ward Co. under the Philco trade name.

This hearing aid was quite small for the time and measured 1¾" x 1⅝" x ½" and weighed 1¼ oz. without the battery.

It had a chrome case and contained 3 transistors. The microphone sits behind the 4 "star bursts" grill (lower left front).

Based on Patent No. 3030586 filed in 1955 and issued in 1962.

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Inside view of the Philco Mark I with the front cover removed showing the circuitry. Note the large microphone in the bottom left quadrant.


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Top view of the Philco Mark I showing the on-off/1-6 position volume control (left), the receiver cord jack (center) and the two-position (High-Low) tone control (right).


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The Philco Mark I had a somewhat unusual plug for the receiver cord. Instead of the two pin plug that was common (and used at the receiver end), it used what looks like a standard audio plug, but it is slightly bigger—just a bit over ⅛" in diameter.


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The back of the Philco Mark I. The control functions are engraved on the back of the case behind the controls to which they refer. In the upper left corner is inscribed "Lo-Hi-Tone" and in the upper right corner, "Vol-On-Off".


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The battery door on the Philco Mark I swung up and to the right from the bottom right corner. This hearing aid used a 625 battery.

The clip across the front of the hearing aid could be used as a tie clip with the hearing aid itself hidden under the tie. (One wonders how well the microphone would pick up sounds with the tie covering the microphone grill.)


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