Beltone Mono-pac Vacuum Tube Hearing Aid The Beltone Mono-pac vacuum tube one-piece hearing aid was produced by the Beltone Electronics Corp. of Chicago, IL beginning in July, 1944. This was Beltone's first 1-piece hearing aid—hence the name "Mono-pac". It measured 5½” by 2¾” by 1¼” and weighed 10½ oz including the batteries. It used 3 vacuum tubes. The base structure of this hearing aid was patented by Sam Posen in 1947—patent number 2431198. |  | Click picture for larger view | | |   | | | |
| The Beltone Mono-pac came in two colors—cream (above) and black (right). The mic grill (upper part) consisted of 3 columns consisting of 8 rows of small rectangles. The clip (center) let a person clip it to a shirt pocket while keeping the microphone above the pocket for unimpeded sound entrance.
|  | Click picture for larger view | | | |
| Top view of the Beltone Mono-pac showing the on-off/volume control wheel (center) and the receiver cord plugged into its jack (right). |  | Click picture for larger view | | | |
| Rear view showing the make and model engraved in the case "Beltone MONO-PAC". |  | Click picture for larger view | | | |
| View of the empty battery compartment of the Beltone Mono-pac. The battery compartment door is hinged at the bottom and swings downward. Note the 3-position tone control (upper center). It was set by screwdriver to "M" mid, "H" high or "L" low tone emphasis. |  | Click picture for larger view | | | |
| View of the battery compartment of the Beltone Mono-pac showing the batteries in place. The "A" battery (top) is a standard 1½ volt "C" cell (No. 935), while the "B" battery is a 30 volt No. 430 E. |  | Click picture for larger view | | | |
| The Beltone Mono-pac in its original case. |  | Click picture for larger view | | | |
| The original case of the Beltone Mono-pac.
|  | Click picture for larger view | | |
|
(If a larger picture doesn't appear, you may have to
turn your pop-up blocker off)
|
| |
