Beltone Model 50 Vacuum Tube Hearing Aid The Beltone Model 50 vacuum tube two-piece hearing aid was produced by the Beltone Electronics Corp. of Chicago, IL in 1943. This was only the second hearing aid Beltone produced. It measured 3¾” by 2¼” by ⅞” and weighed 5 oz without the batteries. It used 3 vacuum tubes. The circular microphone grill consisted of 2 rows of 4 slots behind the vertical ribs on the front of the case. |  | Click picture for larger view | | |  | | | |
| Rear view of the Beltone Model 50. The volume control/on-off wheel is at the top center. Notice the crude V-shaped wire pocket clip. Above the "V" molded into the bakelite case are the words "Beltone Chicago Model" and scratched into the bakelite is the model number "50" and the serial number 2476.
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| The Model 50 came with a crystal receiver (right). |  | Click picture for larger view | | | |
| This was called a 2-piece hearing aid because the batteries were external. If you want to get technical about it, it is actually a 3-piece because there were two batteries. The two-pronged plug (upper right) plugged into a 1½ volt "A" battery, while the 3-pronged plug (lower left) plugged into a 45 volt "B" battery.
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