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

Fidelity Model F-364 Transistor (Body) Hearing Aid

The Fidelity Model F-364 body style transistor hearing aid was manufactured by Viennatone in Austria and distributed in North America under the trade name of "Fidelity" by Fidelity Electronics Ltd of Miami, Florida.

The Model F-364 was was a 5 or 6 transistor model and contained a t-coil. It was made in 1967. The equivalent Viennatone model was either the X5 or X6 model.

This hearing aid measured 2 7/16" high x 1 13/16" wide x 11/16" thick. (6.2 x 4.6 x 1.7 cm) and weighed 2 oz. (56 g) without the battery.

 

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Back

 

View of the lower front of the  Fidelity Model F-364 body style transistor hearing aid showing the twin plastic plugs that seal the adjusting holes.

The adjusting screw on the left is for setting the compression and the one on the right is for adjusting the tone.

The Fidelity model F-364 was the more expensive version of the model F-360 and had more features.

 

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Top view of the  Fidelity Model F-364 body style transistor hearing aid showing the 3-position tone control—L—low frequency emphasis, N—normal and H—high-frequency emphasis (upper left), the 4-position switch for O—off, M—microphone mode, MT—microphone & t-coil together, and T—t-coil only (lower left), the rectangular microphone grill (center) and the 1-9 position volume control (right).

Note: the model F-360 had a dark brown top while the model F-364 had a black top.

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View of the upper left side of the  Fidelity Model F-364 body style transistor hearing aid showing the model number (F-364).

 

 

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View of the upper right side of the  Fidelity Model F-364 body style transistor hearing aid showing the serial number (350568).

 

 

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View of the back of the Fidelity Model F-364 body style transistor hearing aid showing the wire pocket clip.

 

 

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Lower left side view of the  Fidelity Model F-364 body style transistor hearing aid showing the receiver cord plugged into the receiver cord jack.

Directly above it is a hole for reaching an adjusting screw. It is labeled "PC" and has 3 settings 0, -7, -15. It is set at 0.

 

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View of the lower left side of the  Fidelity Model F-364 body style transistor hearing aid showing the receiver cord plug and jack. Note that one hole and one pin are larger so you can only plug it in with the correct polarity.

 

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Bottom view of the Fidelity Model F-364 body style transistor hearing aid showing the pull-off battery door and labeled "FIDELITY" on the left edge.

 

 

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View of the Fidelity Model F-364 body style transistor hearing aid with the battery door pulled off revealing the battery compartment.

 

 

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Close-up view of the battery compartment of the Fidelity Model F-364 body style transistor hearing aid. This hearing aid took a 1.4 mercury "N" cell such as the Duracell RM-401H mercury battery.

The recessed lever (between/above the 1.5 and 3 V) switches the voltage between 1.5 and 3 volts. It is set in the 1.5 volt position. (A rare 2.8 v "N"-sized mercury battery was the Eveready E152N. Doubling the voltage would give more power output for people with severe hearing losses that needed this extra amplification.)

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View of the back of the receiver of the  Fidelity Model F-364 body style transistor hearing aid.

 

 

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View of the side of the receiver of the  Fidelity Model F-364 body style transistor hearing aid showing the two-pronged plug and jack. Note that the jack had different sized holes so the cord couldn't be plugged in wrongly.

 

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View of the front of the receiver of the  Fidelity Model F-364 body style transistor hearing aid.

 

 

 

 

 

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