Fortiphone Model 20 "All-in-One" Vacuum Tube Hearing Aid The Fortiphone Model 20 "All-in-One" vacuum tube hearing aid was manufactured by Fortiphone Ltd. of London, England about 1951. This 3-vacuum tube hearing aid was quite heavy, and weighed 8¼ oz. without batteries. It measured 3⅞" x 2⅜" x ⅞". |  | Click picture for larger view | | |  | | | |
| Top view of the Fortiphone Model 20 in its original case showing the volume control (left), receiver cord plug (center) and on-off/3 position tone control (right).
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| The back of the Fortiphone Model 20. The circle (lower center) is the secret to gaining access to the battery compartment. By pushing the circle in, it pushes the "A" battery into the front of the battery door—popping it open.
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| Close-up of the upper back of the Fortiphone Model 20. It reads: "Fortiphone
All-in-One
Model 20
golden tone hearing"
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| The battery door on the Fortiphone Model 20 is a bit unusual in that it in front-opening, and swings down exposing the battery compartment. The "bar" above the pocket clip pushes in to lift the pocket clip away from the hearing aid body so it can easily slide under the front of a pocket.
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| The Fortiphone Model 20 battery compartment. The 1½ volt "A" battery goes to the left and the larger 22½ volt "B" battery to the right. This hearing aid took an AA sized "A" battery (same as the Eveready 1015E) and an Eveready 412E "B" battery, or a Zenith Z-12-G "B" battery.
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| The Fortiphone Model 20 in its original case
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| The carrying case of the Fortiphone Model 20 hearing aid.
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