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

Zenith Royal [Mod I] Vacuum Tube Hearing Aid

The Zenith Royal [Mod I] vacuum tube hearing aid was manufactured by the Hearing Aid Division of the Zenith Radio Corporation of Chicago, IL beginning in October, 1952.

The Zenith Royal [Mod I] and the Zenith Super Royal [Mod I] were the last vacuum tube hearing aid models produced by Zenith. Four months later (February, 1953) Zenith produced their first transistorized hearing aid, the Royal T.

The Zenith Royal [Mod I] was identical to the Zenith Royal with one exception. It had a t-coil, while the Royal didn't. You can see the t-coil below the "ZENITH" name on the lower front. The t-coil was called a "phone magnet" in those days.

Adding the t-coil necessitated two other changes in the switch placement (shown below). Apart from that, see the Zenith Royal on the previous page for the rest of the details of this hearing aid.


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Top view of the Zenith Royal  [Mod I] showing the 4-position "H" (high), "M" (mid), "L" (low) and "F" (full) tone control (top left), and the 1-7 position volume control/on-off switch (right). The 2-prong receiver jack is in the center (rear).

Here is a copy of the User's Manual for the Zenith Royal hearing aid.

In front of the receiver jack is a two-position A1-A2 switch. This interesting and rare switching arrangement was only used on the Zenith Royal and Super Royal models to switch between either of the two "A" batteries these hearing aids had.

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Right side view of the Zenith Royal [Mod I] showing the "TEL" (t-coil) "MIKE" (microphone) switch (center) and the thumbnail indentation (upper center) labeled "LIFT" to open the battery compartment door.



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