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

Zenith "Sentry" Transistor (Body) Hearing Aid

The Zenith "Sentry" transistor hearing aid was manufactured by the Hearing Aid Division of the Zenith Radio Corp. in 1962. It was an 5-transistor aid.

The Zenith "Sentry" measured 2½" x 1¾" x ¾" thick, and weighed 2 oz. with battery. The case was light copper-toned anodized aluminum with a brown upper front.

The microphone grill was an elongated horizontal oval in the center of the upper front of the hearing aid, and just below it was the wire pocket clip.

Notice the letters "CDR" on the front below the pocket clip. This stood for Controlled Dynamic Range. This was Zenith's version of AGC (automatic gain control). Below that is the Zenith crest.

The aid shown here had binaural receivers. These were hooked up using a "Y" receiver cord.

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Top view of the Zenith "Sentry" showing the 2-position "M" (microphone) and "T" (t-coil) switch (top left), and the volume control/on-off switch (top right). Instead of using numbers from 1-7 to indicate the volume, the Sentry was unusual in that it used the letters from "A" through "G".
 

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The left side of the Zenith "Sentry" showing the 3-pin receiver cord jack (center).

 

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Rear view of the Zenith "Sentry" hearing aid showing the battery door, which opened from the bottom of the case.

The Zenith "Sentry" took an "N" size 1.4 volt No. 401 mercury battery.

 

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Rear view of the Zenith "Sentry" hearing aid. "Volume" is inscribed in the upper left corner. On the upper back is inscribed "Zenith", "SENTRY" and "Controlled Dynamic Range". Just above the battery cover is inscribed "the royalty of hearing".

 

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The Zenith "Sentry" hearing aid in its original case.

 

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Top view of the white Zenith "Sentry" case.

 

 

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