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.

 

Behind the Ear (BTE) Transistor Hearing Aids

Audiotone Model A-28 "Pinal" Behind-the-Ear Transistor Hearing Aid

The Audiotone Model A-28 "Pinal" behind-the-ear (BTE) transistor hearing aid was made by Audiotone, Inc. of Phoenix, AZ in 1975.

The Audiotone Model A-28 measured 1¾" x 9/16" x ½" (4.4 x 1.9 x 1.2 cm) and weighed 0.1 oz.  (4 g) without the battery.

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Side view of the Audiotone Model A-28 "Pinal" behind-the-ear (BTE) transistor hearing aid showing main body (left), ear hook (top right) and ear mold (right).

 


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Rear view of the Audiotone Model A-28 "Pinal" behind-the-ear (BTE) transistor hearing aid showing its triangular-shaped rear profile. It was much thicker at the bottom than at the top.

 


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Lower rear view of the Audiotone Model A-28 "Pinal" behind-the-ear (BTE) transistor hearing aid showing battery compartment door (bottom left), microphone/t-coil switch (center right) in the microphone position and the volume control wheel (bottom right).


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Lower right side view of the Audiotone Model A-28 "Pinal" behind-the-ear (BTE) transistor hearing aid showing the "M" (microphone) and "T" (t-coil) positions for the M/T switch (top) and the name (Audiotone) and model number (A-28) (bottom).


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Top view of the Audiotone Model A-28 "Pinal" behind-the-ear (BTE) transistor hearing aid showing the front-facing microphone port (top right).

 


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Bottom view of the Audiotone Model A-28 "Pinal" behind-the-ear (BTE) transistor hearing aid showing the battery compartment door with the serial number on it (top right) and volume control wheel (bottom right).


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Close-up view of the opened battery compartment door of the Audiotone Model A-28 "Pinal" behind-the-ear (BTE) transistor hearing aid showing the serial number (6961) on it.

 


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View of the opened battery compartment door of the Audiotone Model A-28 "Pinal" behind-the-ear (BTE) transistor hearing aid.

 


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View of the battery compartment of the Audiotone Model A-28 "Pinal" behind-the-ear (BTE) transistor hearing aid showing the No. 675 battery in the battery compartment.

Hearing aids of this vintage typically used a mercury 675 battery such as the Eveready EP675E.

 

 


 

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