Acousticon A-100 (Imperial) Vacuum Tube Hearing Aid The Acousticon A-100 (Imperial) hearing aid was produced by Dictograph Products, Inc. of New York in 1947. It featured a case of gold anodized aluminum with light brown enamel on the left two-thirds of the front. The hearing aid measured 4¾” by 2⅜” by ⅞”. |  | Click picture for larger view | | |   | | | |
| The Acousticon A-100 featured the same controls as the A-90 and A-90M with the volume control/on-off switch at the top left corner, and the microphone on the front behind the slightly-recessed grill/logo at the top right.
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| Left side view of the Acousticon A-100 showing the 4 position tone control. The serial number (6A500) is to the right of the tone control. Note the clip to hold the hearing aid in place on the clothing (bottom left). |  | Click picture for larger view | | | |
| The Acousticon A-100 was powered by a 1.4 volt Mallory RM-4 mercury "A" battery (or the No. 4 battery) and a 22½ volt Eveready 412E "B" battery. |  | Click picture for larger view | | | |
| An interesting feature of the Acousticon A-100 was that the "A" battery compartment was configured so that an Eveready 1015E "A" battery (AA size) could be substituted in place of the Mallory RM-4 mercury battery. |  | Click picture for larger view | | | |
| Another feature of the A-100 was the capability to attach the Acousticon Radion radio tuner to the right side of the hearing aid, thus turning the hearing aid into a personal AM radio for the user. Note the two holes on the right side for the pins of the Radion to attach/connect to. |  | Click picture for larger view | | | |
| The Acousticon A-100 with the Radion attached to the right side of the hearing aid. Click here for more information on the Acousticon Radion.
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