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!

Home Enter the Museum About Us Contact Us

FREE Subscription to:
Hearing Loss Help
The premier e-zine for people with hearing loss

Your email address
will never be
rented, traded or sold!

Your First Name:
Your E-mail:
Search this site:

 Results per
 page

 all words
 any words


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

Radioear Model A-28 Vacuum Tube Hearing Aid

The Radioear model A-28 was a table-top model vacuum tube hearing aid that ran on house current. It was manufactured by E. A. Myers & Sons of Pittsburg, PA in 1930.

This hearing aid was a "heavy beastie" weighing in at 8˝ lbs. It measured 9” wide by 6⅞" high by 4⅞" deep.

Click picture for larger view

 

Next

 

The double carbon transmitter (microphone) is located in an opening in the bottom front of the hearing aid (right).

The knob at the left was the volume control/on-off switch. The knob can be set to any level between 10 and 100.


 

Click picture for larger view

 

The Model 28-A used two large vacuum tubes—a 471-B and a 433 or equivalent. The vacuum tubes now in this hearing aid are a 171-A and a 33.

 

Click picture for larger view

 

The inside back showing the position and type of the original tubes. The tube on the left was originally a De Forest Audicon 471-B or equivalent while the tube on the right was originally a De Forest Audicon 433 or equivalent.

 

Click picture for larger view

 
The magnetic receiver (earpiece) and power cord were stored in a small compartment in the top front of the hearing aid.

 


 

Click picture for larger view

 

(If a larger picture doesn't appear, you may have to turn your pop-up blocker off)