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.


Body Type Transistor Hearing Aids

Danavox Model 747-PP Binaural Transistor Hearing Aid

The Danavox Model 747-PP transistor hearing aid was manufactured by Danavox International A/S of Denmark in 1974. It was rather large in size for the period and measured 3 1/8" by 2¾" by 7/8".

This body-style aid had an integrated circuit amplifier, in addition to using some discrete transistors. It came with rechargeable batteries.


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A unique feature of this aid is that it was a true stereo hearing aid—the only one in the museum. Notice the two microphones (top left and right corners) and the two volume controls (red wheels center). The on/off switch is below them.

The telecoil/microphone switch (top center) had three positions—microphones only (M), telecoils only (T) and both microphones/telecoils at the same time (MT).

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The Danavox 747-PP in its original box.



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The charger for the Danavox 747-PP.


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The Danavox 747-PP in its charger. It used rechargeable nickel-cadmium batteries.

Read the original Danavox 747 Owner's manual courtesy of Rose Sheppy in the UK.



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