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

Griffin & Tatlock "Microdeaf" Vacuum Tube Hearing Aid

This table model or box style vacuum tube hearing aid is marked Microdeaf Hearing Aid and is signed Griffin & Tatlock, 19 Cheetham Hill Road, Manchester.

The date of manufacture is unknown, but it is very similar to other hearing aids of the same style manufactured in the late 1930s. This style of hearing aid had self-contained batteries and was made to resemble the box cameras of the era.

The dimension were 5 13/16” high by 4 15/16” wide by 4¼” deep with a weight of almost 2 lbs. without batteries. The "A" and "B" batteries, of unknown type, fitted into a compartment that took up half of the internal volume of the hearing aid.
 

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The microphone was mounted on one side (top picture bottom center) and the volume control around the corner on an adjacent side (top center). The earphone jack was to the right of the volume control knob.

 This hearing aid could be set on a table or carried by hand. It had an earphone that was worn over the head with a headband. (The earphone is shown here but the headband is now missing.)

 

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The hearing aid used two miniature vacuum tubes (top center). A large capacitor is beside them in the corner (top right). The back of the microphone is at the left. The battery compartment is at the front. The battery compartment door was held closed by brass clips on each side of the box.

Griffin & Tatlock were manufacturers of scientific and laboratory equipment and it is not known whether or not they produced any other hearing aid models. This is the only one we have encountered.

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A close up of the front side of the earphone.

 

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A close up of the back side of the earphone. Also, notice the interesting arrangement of the earphone plug. There was one male pin and one female socket on the plug (right) and a corresponding female socket and male pin on the hearing aid to plug it into. (You can see the lone male pin sticking out in the top picture to the right of the volume control.) This curious pin arrangement was common on English hearing aids of this period.

 


 

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