Beltone Mono-pac Model AL "Allegro" Transistor (Body) Hearing Aid
The Beltone Mono-pac Model AL "Allegro" was produced by the Beltone Electronics Corp. of Chicago, IL
in 1954.
It measured 2¼” by 1½” by ⅝” and weighed 2 oz without the battery. It
used 3 transistors.
The case was chrome front and back over a brown plastic
chassis—visible on all sides. It came in two versions--a shirt pocket
version and a tie-clip version (shown here).
The square microphone grill in the center of the front of the case
consists of two columns of 5 rectangular slots.
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Top view of the Beltone Mono-pac Model AL showing the volume
control/on-off switch (top left), and the receiver cord jack (right).
The square hole above the right side of the receiver jack was for a
protrusion on the receiver cord plug so it couldn't be plugged in wrong. |
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Left side view of the Model AL showing the 2-position tone control. |
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Rear view of the Model AL showing the make and model engraved in the case "Beltone
MONO-PAC Model AL". Note the
yellow dot on the right side above the
hinge.
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Comparison of two versions of the Beltone AL "Allegro" hearing aid.
The model on the left has a standard pocket clip for wearing in a shirt
pocket. The version on the right has a tie-clip so the hearing aid could
be worn hidden under a man's tie. |
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View of the battery compartment of the Beltone Model AL. The
battery compartment door is hinged at the top and swings upward.
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View of the battery compartment of the Beltone Model AL showing the
battery in place. It used an
No. 450 1.4 volt mercury battery.
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The Beltone Mono-pac Model AL in its original case. |
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Outside view of the original case of the Beltone Mono-pac Model AL.
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