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

Oticon Model P11P Transistor (Body) Hearing Aid

The Oticon Model P11P transistor body hearing aid was produced by Oticon A/S of Denmark in 1975, but actually manufactured in their plant in Scotland. (Oticon set up a plant in Scotland in 1973 as a requirement for getting a contract with Medresco/British Ministry of Health to have them carry their hearing aids for distribution to the UK.)

This body aid measured 2½" x 1¾" x   ¾" (6.3 x 4.4 x 1.9 cm) and weighed 1.4 oz. (40 g) without the battery.

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Top view of the Oticon Model P11P transistor body hearing aid showing the "M" (microphone), "MT" (microphone & t-coil) and "T" (t-coil) switch (upper left), the 1-9 volume control wheel (lower left) and the On (+) - Off (0) switch (lower right).

The microphone grill (center) is composed of 3 rows of 5 tiny slots.

 

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Rear view of the Oticon Model P11P transistor body hearing aid showing the battery door (right side) in its closed position.


 

 

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Rear view of the Oticon Model P11P transistor body hearing aid showing the battery compartment with the battery door swung out. This hearing aid took a standard 1½ volt AA battery.

 


 

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Left side view of the Oticon Model P11P transistor body hearing aid showing the battery door arrangement. To open the battery door you just pushed on the part of the side sticking out.

Note the wire pocket clip on the front (top).
 

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Close-up view of the lower right side of the Oticon Model P11P transistor body hearing aid showing the 3-pronged receiver cord plug and jack. Note that the center pin was not used. The plug could fit into the jack with the cord end up or down although it was usual to have the cord end facing up (to the left).

 

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Bottom view of the Oticon Model P11P transistor body hearing aid showing the screw adjustment for the overall gain (130 - 142 dB SPL) and the screw adjustment for the tone (from low to high). (SPL is the acronym for Sound Pressure Level.)

On the right is the model number (P 11 P) and where it was made (Scotland).

On the far right is the serial number (208511).

 

 

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