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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