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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 |
Fortiphone Model 23 Vacuum Tube Hearing Aid
The Fortiphone model 23 vacuum tube hearing
aid was manufactured by Fortiphone Ltd. of London about 1952 or 1953.
This hearing aid weighed 4 oz. including batteries.
It measured 3⅛" x 1⅞" x ¾".
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The back opened showing the battery compartment.
The Fortiphone 23 was powered by a 30 volt "B" battery type 506E, and a
1.4 volt RM-1 mercury "A" battery.
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