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On-line 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. |
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Vacuum Tube Hearing Aids:
1921-1953 |
Zenith Ravox Table Model Vacuum Tube Hearing Aid
The Zenith Ravox table model vacuum tube hearing aid was manufactured
in 1939 by the Zenith Radio Corporation of Chicago, IL. Apparently this
was their first hearing aid and was followed by their Model A2A wearable
hearing aid in 1942.
The unit weighed 6 lbs. and measured 6¼” by 4¼” by 8¼” deep.
You can see the volume control knob on the right side. The tone control
knob is peeking out from behind the handle on the top at the rear.
The grill at the front conceals the microphone. |
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The Ravox was a three vacuum tube model, and used tubes numbered 6Z4,
41, and 79. It operated on 110 volts AC house current.
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The ear side of the Brush Crystal type earphone. It was held on with
a headband (shown in top picture). |
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The back side of the earphone.
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