Hugh Hetherington Hearing Aid Museum
Hugh Hetherington Hearing Aid Museum

The Hearing Aid Museum

Hearing Aids of all types—Ear Trumpets, Carbon Hearing Aids, Vacuum Tube Hearing Aids, Transistor Hearing Aids, Body Hearing Aids, Eyeglass Hearing Aids and much more!

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Click on the "General Information" button (top button above) for an overview and general information on this category of hearing aid.

 

Vacuum Tube Hearing Aids: 1921-1953

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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