Zenith "Royal M" Transistor (Body) Hearing Aid
The Zenith "Royal M" transistor hearing aid was manufactured by the
Hearing Aid Division of the Zenith Radio Corp. beginning in May,
1954. It used 3 transistors.
Its gold anodized aluminum case measured 2⅝" x 1¾" x
⅝" thick, and weighed a total of 3 oz. with battery.
The microphone grill was a black vertical rectangle with the Zenith
crest in the middle of it (upper front
center).
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Top view of the Zenith "Royal M" showing the 4-position tone
control (left), the receiver cord jack (center) and the 1-7 volume
control/on-off switch (right). The tone control was labeled "M" (mid),
"L" (low), "F" (full), "H" (high). Here
is a copy of the
User's Manual for the Zenith Royal M hearing aid.
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Rear view of the Zenith "Royal M" showing how the battery door swings
up
revealing the battery compartment (bottom). The Zenith "Royal M" took an
"N" size 1.4 volt No.
401 mercury battery. |
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Rear view of the Zenith "Royal M". Engraved into the
upper back, on separate lines, are the words, "Zenith", "Royal",
"M", "the royalty of hearing". |
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The Zenith "Royal M" in its original carrying case. |
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Top view of the Zenith's "Royal M" carrying case.
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