Acousticon Model SRB Carbon Hearing Aid The Acousticon model SRB was a single microphone carbon hearing aid manufactured between 1910 and 1928 by the General Acoustic Company, which later became Dictograph Products, Inc. It cost $40.00. The earphone is on the right and the carbon microphone is on the left. The Acousticon Model SRB was powered by a 3 volt Acousticon No. 2-R zinc-carbon battery.
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| The reverse view of the Acousticon SRB, showing the back of the earphone (left) and the back of the carbon microphone (right). The carbon microphone is 3 5/16" in diameter. It featured a 6-step volume control (bottom half). The volume is shown at almost the loudest setting. The metal clip (top center) secured it to the user's clothing. The on-off switch is on the earphone. There is a sliding bar (going from about 10 o'clock to 2 o'clock through the earphone). The picture shows the shiny on/off push button sticking out at 2 o'clock (the on position). |  | Click picture for larger view | | | |
| Close-up of the back of the Acousticon SRB carbon microphone showing the model number (SRB) (upper left). |  | Click picture for larger view | | | |
| The Acousticon came with a leather storage case (right). |  | Click picture for larger view | | | |
| The inside of the storage case showing the compartments for the various components.
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| The Acousticon SRB came with a small handle that attached to the earphone if you wanted to hold it up to your ear. |  | Click picture for larger view | | | |
| The handle unhooked from the earphone for storage, or if you wanted to use the earphone with a headband. |  | Click picture for larger view | | | |
| The earphone with the headband attached.
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