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.

 

Body Type Transistor Hearing Aids

Beltone Mono-pac Model TR  Transistor (Body) Hearing Aid

The Beltone Mono-pac Model TR was the first completely transistorized hearing aid produced by the Beltone Electronics Corp. of Chicago, IL This model "TR" was obviously nicknamed for "Transistor". Beltone produced it in 1953.

 It measured 3⅛” by 2⅛” by ¾” and weighed 4½ oz including the battery. It used 3 transistors.

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Front view of the Beltone Mono-pac Model TR showing the microphone grill (upper center) and below it the pocket clip. To the left of the microphone grill is the volume control/on-off switch.

The case was similar to the Model M "Melody"—chrome front and back over a black plastic chassis—visible on all sides.

 

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Top view of the Beltone Mono-pac Model TR showing the receiver cord plugged into the jack (left).

Note: this hearing aid used the same case back as the Model M (Melody)—hence the "cut out" (lower center) where the Melody's 2-position tone control was. The Model TR did not have any tone control.

 

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Rear view of the Model TR showing the make and model stamped into the case (top half). The swing-up battery compartment door comprises the lower half of the back.

 

 

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Close-up view of the top half of the back of the Beltone Model TR hearing aid showing the make and model stamped into the case "Beltone MONO-PAC Model" and the TR is in the punched out hole".

This is because they used the same case back as the Model M—so they punched out the "M" and on a small plate behind it printed the "TR".

Note the dot hole on the left side above the hinge is not used—it has been left blank.

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Bottom view of the Beltone Mono-pac Model TR hearing aid showing the push-button (center) to release the spring-loaded battery compartment door.

 

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View of the battery compartment of the Beltone Mono-pac Model TR showing the battery terminal contacts. The battery compartment door is hinged at the top and swings upward.

Note the serial number (613851) on the right.

 

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View of the battery compartment of the Beltone Mono-pac Model TR showing the 1¼ volt Mallory TR-140 mercury battery in place.

 

 

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Close-up view of the top left corner of the  Beltone Mono-pac Model TR hearing aid showing the two-holed received cord jack.

Note the notch cut out of the plastic in front of the left hole.

 

 

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Close-up view of the receiver cord plug of the  Beltone Mono-pac Model TR hearing aid.

Note the plastic flange sticking up (at the back). This corresponded with the notch in the plastic of the body aid shown above.

 

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Close-up view of the top left corner of the Beltone Mono-pac Model TR hearing aid showing how the receiver cord plug plugged into the jack and the flange on the plug fitted exactly into the notch on the body of the aid.

This arrangement guaranteed that the plug was inserted properly with reference to the polarity of the pins on the plug.

 

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View of the back of the receiver of the Beltone Mono-pac Model TR hearing aid showing the receiver cord plugged in.

 

 

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Close-up of the receiver cord jack and receiver cord plug of the Beltone Mono-pac Model TR hearing aid. Note the left pin is smaller than the right pin so the cord could only be plugged into the receiver one way to correctly maintain the polarity of the system.

 

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Front view of the receiver of the  Beltone Mono-pac Model TR hearing aid. This receiver was Beltone's model TM3 (right).

 

 

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The receiver and ear mold of the Beltone Mono-pac Model TR hearing aid shown unsnapped. The ear mold snapped onto the nubbin in the center of the receiver.

 

 

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The Beltone Mono-pac Model TR transistor hearing aid in its original case.

 

 

 

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Outside view of the original case of the Beltone Mono-pac Model TR hearing aid.

 

 


 

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