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

Magnatone Model TR-7 Transistor (Body) Hearing Aid

The Magnatone Model TR-7 transistor body hearing aid was made for Magnatone (unknown distributor, unknown location) by Conny Industrial Co. Ltd, Tokyo, Japan in 1959.

Note that the Model TR-7 was sold by Conny under their own name, and by Magnatone and Lafayette under their respective names.

This 4-transistor hearing aid was 2⅝" high x 1¾" wide x 11/16" thick (6.7 x 4.5 x 1.8 cm) and weighed 2.1 oz. (60 g) without the battery.

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Front view of the Magnatone Model TR-7 transistor body hearing aid showing the V-shaped wire pocket clip (upper center) that curves around the triangular microphone grill.

 

 

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Lower front view of the Magnatone Model TR-7 transistor body hearing aid showing the "private label" Magnatone name.
 

 

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Top view of the Magnatone Model TR-7 transistor body hearing aid showing the 4-position tone control (left), the two-prong receiver cord jack (center) and the 1-7 on-off/volume control (right).

The tone control symbols were as follows: F (flat frequency response), L (low tones stressed), M (medium tone) and H (high tones stressed).

 

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Top view of the Magnatone Model TR-7 transistor body hearing aid showing the two-pronged receiver cord plug and jack (shown unplugged). Note the unusually long pins on the plug.

 

 

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Left side view of the Magnatone Model TR-7 transistor body hearing aid showing the "Mic" & "Tel" lever for switching between the microphone and t-coil. (shown in the microphone position).

 

 

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Front page of the Magnatone Model TR-7 transistor body hearing aid instruction brochure. Read the Magnatone instruction sheet here.


 

 

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Rear view of the Magnatone Model TR-7 transistor body hearing aid showing markings for "Volume" (top left), "Tone" (upper right), t-coil (lower center), and on the battery door (bottom) "4 Transistors" and "Japan".
 

The case was the common light gold color used on many hearing aids of the day.

 

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View of the empty battery compartment of the Magnatone Model TR-7 transistor body hearing aid with the battery door swung up from the bottom.

 

 

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Inside the battery door of the Magnatone Model TR-7 transistor body hearing aid was a sticker showing the serial number (852980) and the model number (TR-7).

 

 

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The Magnatone Model TR-7 transistor body hearing aid used a 1.5 volt size "N" carbon-zinc battery such as this Lamina UM-5 battery.

 

 

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Rear view of the receiver of the Magnatone Model TR-7 transistor hearing aid with the receiver cord plugged into it.
 

 

 

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Front view of the receiver of the Magnatone Model TR-7 transistor hearing aid showing the removable stock ear tip (shown attached here).
 

 

 

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The receiver of the Magnatone Model TR-7 transistor body hearing aid is shown here unplugged from the receiver cord. The prongs on the plug are unusually long.

 

 

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The Magnatone Model TR-7 transistor hearing aid in its original carrying case.

 

 

 

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Outside view of the original carrying case for the Magnatone Model TR-7 transistor hearing aid. The case measured 4½" x 2¼" x 1½" (11.4 x 5.7 x 3.8 cm).

 

 

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Close-up view of the design embossed into the top of the case of the Magnatone TR-7 transistor hearing aid.

 

 

 

 

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