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

Maico Model UD "Atomeer" Vacuum Tube Hearing Aid

The Maico model UD (Atomeer) was produced by Maico Electronics, Inc. of Minneapolis, MN in 1947. The name "Maico" was derived from the initials of the Medical Acoustic Instrument Company.

It was a 3 vacuum tube one piece model measuring 4⅝” by 2˝ by 1”. It weighed 7˝ oz. with batteries.

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The volume control was in the top left corner and the on-off/tone control (3 tone selections) was on the top right corner.

 

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A close-up of the front of the circuit board showing the 3 tubes (top left and top right sides and bottom left) and the microphone in the middle.

 

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A close-up of the rear of the circuit board.

 

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The Maico Model UD from the rear showing the battery compartment. A round mercury RM-4 "A" battery fitted in the bottom right corner, while a Model 413E 30 volt "B" battery fitted in the space on the left.

 


 

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