Beltone Mono-pac Model S "Symphonette" Vacuum Tube Hearing Aid
The Beltone Mono-pac Model S "Symphonette" vacuum tube one-piece hearing
aid was produced by the Beltone Electronics Corp. of Chicago, IL
in 1948.
It measured 3⅝” by 2¼” by ⅞” and weighed 6 oz including the batteries. It
used 3 vacuum tubes. This hearing aid used a printed circuit.
The case was a light tan-colored plastic front with a chrome back. Pocket clip is on the front in the center.
The microphone grill (top center) is in the shape of a
square with rounded corners and inlaid with a filigree pattern.
Shown with the receiver is a phantom ear mold so the receiver button
could be hidden below the collar making the ear mold much less visible.
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Top view of the Beltone Model S showing the 2-position tone control
(labeled on the back as "1" and "2") (center) and the receiver cord jack (right). |
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View of the left side of the Model S showing the volume control/on-off
switch. |
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Rear view of the Model S showing the make and model engraved in the case "Beltone
MONO-PAC Model S". Note the green dot beside the M (left just
above the hinge). A dot here seems to indicate this aid used a magnetic
receiver rather than a crystal one. |
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View of the battery compartment of the Beltone Mono-pac Model S showing the
batteries in place. The "A" battery (center) is an
RM-3 1.4 volt
mercury battery, while the "B" battery is a 22½ volt
No. 412 E. The
battery compartment door is hinged at the top and swings upward.
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The Beltone Mono-pac Model S "Symphonette" in its original case. |
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Outside view of the original case of the Beltone Mono-pac Model S.
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