Acousticon A-90 (Imperial) (2-piece) Vacuum Tube Hearing Aid The Acousticon A-90 (Imperial) two-piece hearing aid was produced by Dictograph Products, Inc. of New York in 1947. This model was their last 2-piece model as subsequent models were all made with internal batteries. In fact, they came out with a new 1-piece version of the Model A-90 later in 1947. |  | Click picture for larger view | | |   | | | |
| The 2-piece model of the Acousticon A-90 hearing aid featured a maroon or wine colored body measuring 2¾” by 2⅜” by 13/16”. By the standards of the day it was one of the smaller 2-piece models with a round microphone opening on the front (hidden by the decorative grill/logo) and a volume control on the top left.
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| Left side view of the 2-piece Acousticon A-90 showing the 4 position tone control. Note the clip to hold the hearing aid in place on the clothing (bottom left). |  | Click picture for larger view | | | |
| The 2-piece Acousticon A-90 showing the ear piece or receiver (left) and the battery cords for the "A" and "B" batteries (right) |  | Click picture for larger view | | | |
| The external batteries for the 2-piece Acousticon A-90 were a 1½ volt "A" battery (left) and a 22½ or 30 volt "B" battery (center). |  | Click picture for larger view | | | |
| A close-up of the receiver and the black ear mold attached it it. At this time, although many ear molds were still stock models, custom ear molds were available.
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