Acousticon Model A-55 "Symphonic" Vacuum Tube Hearing Aid The Acousticon A-55 "Symphonic" was a two-piece vacuum tube hearing aid manufactured by Dictograph Products, Inc. of New York between 1942 and 1945. In 1945 it was modified and became known as the "Super-Power". The overall dimensions of the aid, which came in black or clear plastic, was 4" by 2¼" by 7/8". In the Unipac model (see below) the leather case increased the size to 5½" by 2½" by 1". |  | Click picture for larger view | | |   | | | |
| Close-up showing the Acousticon A-55 with the black case. This model is the two-piece, pre 1945 model with a black case.
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| The pre-1945 Acousticon A-55 was a two piece unit as the batteries were separate. The picture at the right shows the two battery plugs—the smaller 2-prong plug for the "A" battery and the larger 3-prong plug for the "B" battery. |  | Click picture for larger view | | | |
| Close-up of the rear of the Acousticon A-55 (1945 "Unipac" model) showing its clear plastic case so you could see all the components. The plastic front was frosted so you couldn't see into it from the front. |  | Click picture for larger view | | | |
| In 1945 they came out with the "Unipac" model that kept the batteries in a leather case with the hearing aid. The picture at the right shows this new battery holder. The Eveready 504 15-volt "B" battery mounted horizontally in the top holder and the larger "C"-sized 1½ volt "A" battery in the bottom mount. |  | Click picture for larger view | | | |
| The Acousticon A-55 "Unipac" showing the hearing aid (center), ear piece (top) and battery holder (bottom). |  | Click picture for larger view | | | |
| The 1945 "Unipac" showing the optional "genuine morocco" leather case. The case contained both the batteries and the hearing aid making this a one-piece hearing aid. |  | Click picture for larger view | | |
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