Western Electric Model 36A (Audiphone) Carbon Hearing Aid The Western Electric Model 36A carbon hearing aid was manufactured by the Western Electric Company in 1932. It consisted of two parts, a 616C carbon microphone, and a 584A miniature receiver. Batteries were contained in a separate battery case (not shown). Operating voltage was typically 4˝ volts. |  | Click picture for larger view | | |   | | | |
| Front view of the Model 616C carbon microphone. It was 2⅜” in diameter and weighted only 3 oz. |  | Click picture for larger view | | | |
| Rear view of the Model 616C carbon microphone. It attached to the clothing by the metal clip (top center). |  | Click picture for larger view | | | |
| The Model 584A miniature earpiece (receiver) with a stock earmold attached (left) and the Model 60B on-off switch and sliding volume control (rheostat) (right). |  | Click picture for larger view | | | |
| A close-up of the Model 584A miniature receiver (left) with a stock ear mold (right).
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