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.

 

Eyeglass Style Transistor Hearing Aids: 1954-1990

Fidelity Model F-228 Eyeglass Hearing Aid

The Fidelity Model F-228 eyeglass hearing aid was distributed in the USA by Fidelity Electronics Ltd. of Chicago, IL under the Fidelity trade name. It likely dates to 1970 or 1971.

Fidelity commonly imported hearing aids from Viennatone with the Fidelity trade name on them. This model is quite similar to the Viennatone Model AF of 1970.

This was a bone-conduction model.

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Backside view of the Fidelity Model F-228 eyeglass hearing aid temple-piece showing the bone conduction transducer (right).

 

 

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Close-up view of the Fidelity Model F-228 eyeglass hearing aid showing the bone conduction transducer. The transducer fitted behind your ear on the mastoid bone and transmitted vibrations through the skull to the inner ear, essentially bypassing the middle ear. Thus it was good for people with conductive losses.

Note the model number "F-228" (very faint) immediately above the transducer.
 

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Close-up view of underside of the temple-piece of the Fidelity Model F-228 eyeglass hearing aid showing the serial number (082460) (center) and the peak clipping screwdriver control (right). The "PC" stands for peak clipping, and the "O" is off. The amount of peak clipping was adjustable by the hearing aid fitter.

 

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View of the underside of the Fidelity Model F-228 eyeglass hearing aid showing the screwdriver adjustable tone control (left) just in front of the ear. This control gave more high frequency emphasis the more it was adjusted. The letters stand for "N" (normal) and "H" (high frequency emphasis).

Ahead of the tone control is the "O" (off), "T" (t-coil) and "M" (microphone) switch (right).
 

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Side view of the switch of the Fidelity Model F-228 eyeglass hearing aid shown in the "T" position.

Ahead of the switch is the microphone port (left). The downward-facing microphone was located approximately half way along the temple-piece.

 

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View of the underside of the temple-piece of the Fidelity Model F-228 eyeglass hearing aid showing the microphone port (left) and the volume control (right). The volume control was near the front end of the temple-piece.

 

 

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Rear view of the Fidelity Model F-228 eyeglass hearing aid showing the battery door in its closed position. The battery door swung up from the bottom.

 

 

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Inside view of the Fidelity Model F-228 eyeglass hearing aid showing the thumb catch on the battery door to help get it open.

 

 

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View of the battery compartment of the Fidelity Model F-228 eyeglass hearing aid with a 675 battery in place.

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

 

 

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The Fidelity Model F-228 eyeglass hearing aid was built into a temple-piece. In order for the eyeglasses to fit different-sized people's heads, there were different length tips to lengthen or shorten the temple-piece. These tips snapped into the front end of the temple-piece.

 

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Close-up view of the end of the temple-piece of the Fidelity Model F-228 eyeglass hearing aid showing how a tip pushed into the slot in the end of the temple-piece.

 

 

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View of the Fidelity Model F-228 eyeglass hearing aid showing a temple-piece tip in place.

Note the Fidelity name on the temple-piece (center).
 

 

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View of a Fidelity Model F-228 eyeglass hearing aid "dummy" temple-piece for the non-hearing aid side of the eyeglasses. It was a coppery-brown color. Note the Fidelity name on the underside near the right side.
 

 

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Inside view of a Fidelity Model F-228 eyeglass hearing aid "dummy" temple-piece for the non-hearing aid side of the eyeglasses.

 

 

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View of the soft carrying case that came with the Fidelity Model F-228 eyeglass hearing aid.

 

 

 

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Close-up view of the upper part of the soft carrying case that came with the Fidelity Model F-228 eyeglass hearing aid showing the Fidelity name embossed on it. Below the word "Fidelity" are the words "Hearing Instruments, Inc.".

 


 

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