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.
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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.
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Top view of the Beltone Mono-pac showing the on-off/volume control
wheel (center) and the receiver cord plugged into its jack (right). |
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Rear view showing the make and model engraved in the case "Beltone
MONO-PAC". |
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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.
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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. |
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The Beltone Mono-pac in its original case. |
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The original case of the Beltone Mono-pac.
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