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. |
 |
Click picture for larger view |
| |
|
|
|
|
The volume control was in the top left corner and the on-off/tone
control (3 tone selections) was on the top right corner.
|
 |
Click picture for larger view |
| |
|
|
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. |
 |
Click picture for larger view |
| |
|
|
A close-up of the rear of the circuit board. |
 |
Click picture for larger view |
| |
|
|
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.
|
 |
Click picture for larger view |
| |
|
(If a larger picture doesn't appear, you may have to
turn your pop-up blocker off)
|
|
|
