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.

Vacuum Tube Hearing Aids: 1921-1953

Zenith 75 "Radionic" Vacuum Tube Hearing Aid

The Zenith 75 "Radionic" vacuum tube hearing aid was manufactured by the Hearing Aid Division of the Zenith Radio Corporation of Chicago, IL beginning in 1947.

The case was partially "frosted" and partially clear plastic. It measured 5⅜” by 2⅝” by ⅞” thick, and weighed 5¾ oz. without the batteries.

The microphone grill was a series of 3 semi-circles (top center). The "Zenith" name is directly above the microphone grill.

The Zenith Model 75 used three vacuum tubes. It sold for $75.00, thus the model number also served as the price code.

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Top view of the Zenith Model 75 showing the 4-position (1-4) tone control/on-off switch (left), and the 1-8 position volume control (right). The 2-prong receiver jack is in the center at the back.


 

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Rear view of the Zenith Model 75 hearing aid. The pocket clips are on each side (upper half). The bottom half covers the battery compartment.


 

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Close-up view of the back of the Zenith Model 75 showing the information engraved there.


 

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Rear view of the Zenith Model 75 hearing aid with the battery cover removed. A 1½ volt "A" battery such as the Zenith No. Z-1M went on the right and a 30 volt "B" battery such as the Eveready No. 413E went on the left.

 

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View of the Zenith Model 75 battery compartment. It could be completely removed from the hearing aid (as shown).

Here is the 12-page manual for the Zenith 75 hearing aid.


 


 

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