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.

 

Vacuum Tube Hearing Aids: 1921-1953

Micronic Model 303 Vacuum Tube Hearing Aid

The Micronic Model 303 one-piece vacuum tube hearing aid was made by Micro-Electronic Products, Inc. of Boston, MA in 1950.

The Micronic Model 303 vacuum tube hearing aid measured 3½” by 2¼” by 13/16” thick (8.9 x 5.7 x 2.0 cm). Without batteries, it weighed  3.2 oz. (90 g).

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Back

 
Front view of the Micronic Model 303 vacuum tube hearing aid showing the attractive light gold-colored aluminum front. The microphone grill consisted of 5 short horizontal slots (upper front).

To the right of the microphone grill was the Micronic logo—a crowned "M".

Note the pocket clips on each side (near the top).

 

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Top view of the Micronic Model 303 vacuum tube hearing aid showing the on-off/3-position tone control (left), the two receiver cord jacks (center) and the volume control wheel (right).


 

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Side view of the Micronic Model 303 vacuum tube hearing aid showing the pocket clips on the side. (Later versions of the Model 303 had the pocket clips on the front.)

 

 

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Rear view of the Micronic Model 303 vacuum tube hearing aid showing the black metal back with swing down battery door (lower half).

 


 

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Rear side view of the battery compartment of the Micronic Model 303 vacuum tube hearing aid. The battery door swung down and out.
 


 

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View of the inside of the battery door of the Micronic Model 303 vacuum tube hearing aid showing the make (Micronic), model number (303) and place of manufacture (Boston, Mass).


 

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Close-up view of the battery compartment of the Micronic Model 303 vacuum tube hearing aid. This hearing aid used a 1½ volt "A" battery such as the Eveready 1015E and a 22½ volt "B" battery such as the Eveready 412E.

 

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The Micronic Model 303 vacuum tube hearing aid was rather unusual in that it had not just one, but two receiver cord jacks. The upper jack was for plugging in a magnetic receiver and the lower one was for plugging in a crystal receiver (or possibly vice versa).

 

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View of the Micronic Model 303 vacuum tube hearing aid showing the receiver cord and two-prong plug (receiver missing).

 

 

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View of the Micronic Model 303 vacuum tube hearing aid in its original carrying case.

 

 

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Outside view of the Micronic Model 303 vacuum tube hearing aid's carrying case.

 

 


 

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