Acousticon Model 17 "Silver Seal Symphonic" Carbon Hearing Aid The Acousticon Model 17 "Silver Seal Symphonic" carbon hearing aid was a single microphone carbon hearing aid manufactured in 1935 by Dictograph Products, Inc. of New York, NY. The double carbon microphone, carbon amplifier and cords weighed 6.7 oz (190 g). |  | Click picture for larger view | | |   | | | |
| Front view of the Acousticon Model 17 "Silver Seal Symphonic" carbon hearing aid showing the dark brown, bakelite, double carbon microphone and the decorative microphone grills. This microphone case measured 4⅞" (12.3 cm) by 2⅝" (6.6 cm) by ¾" (1.9 cm) thick. |  | Click picture for larger view | | | |
| Rear view of the Acousticon Model 17 "Silver Seal Symphonic" carbon hearing aid showing the name and model number. Around the oval, the inscription reads "Acousticon U.S. Patent No. 844635 Made in the United States of America Model 17 No. 551". The Dictograph logo is in the center. |  | Click picture for larger view | | | |
| Close-up of the back of the Acousticon Model 17 "Silver Seal Symphonic" carbon hearing aid carbon microphone showing the Model No. 17, the serial number No. 551 and below that the Dictograph company logo. |  | Click picture for larger view | | | |
| Close-up of the top end of the rear of the Acousticon Model 17 "Silver Seal Symphonic" carbon microphone showing the pocket clip. |  | Click picture for larger view | | | |
| Close-up of the bottom edge of the Acousticon Model 17 "Silver Seal Symphonic" carbon hearing aid microphone showing how the 2-pronged cable (with volume control attached) plugged into it. |  | Click picture for larger view | | | |
| Close-up of the volume control of the Acousticon Model 17 "Silver Seal Symphonic" carbon hearing aid. The volume control was built into the plug assembly. The volume control turned about 90°. There are faint numbers on the base of the volume control (ranging from 1 to 10) indicating the volume setting. |  | Click picture for larger view | | | |
| Front view of the Acousticon Model 17 "Silver Seal Symphonic" carbon amplifier. The carbon amplifier plugged directly into the top of a 4.5 volt battery such as the General EP-129 battery. Note that the plugs are of different sizes to preserve correct polarity. |  | Click picture for larger view | | | |
| Top view of the carbon amplifier of the Acousticon Model 17 "Silver Seal Symphonic" carbon hearing aid showing the dots (1 dot left & 2 dots right) to correctly line up the plugs and corresponding sockets. This carbon amplifier measured 1¾" (4.5 cm) wide by 15/16" (2.4 cm) high by 1" (2.5 cm) deep. |  | Click picture for larger view | | | |
| End view of the Acousticon Model 17 "Silver Seal Symphonic" carbon amplifier showing the 1-dot end. The two-pronged plug and socket was for connecting the headphone to the carbon amplifier. |  | Click picture for larger view | | | |
| End view of the Acousticon Model 17 "Silver Seal Symphonic" carbon amplifier showing the 2-dot end. The three-pronged plug and socket was for connecting the microphone to the carbon amplifier. |  | Click picture for larger view | | | |
| The pins shown plugged into the headphone (missing) of the Acousticon Model 17 carbon hearing aid.
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