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.

 

Body Type Transistor Hearing Aids

Danavox Model 727 PPX Transistor Hearing Aid

The Danavox Model 727 PPX transistor body hearing aid was made by Danavox International A/S of Copenhagen, Denmark in 1972.

This hearing aid contained 6 transistors and measured 2½" wide x  2 1/16" high x 11/16" thick (6.4 x 5.2 x 1.8 cm) and weighed 2.4 oz. (70 g) without the battery.

Missing are the receiver, receiver cord and ear mold.

Click picture for larger view

 

Back Next

 

Top view of the Danavox Model 727 PPX transistor body hearing aid showing the volume control (1-10) (left), the rectangular microphone grill (center), the 3-position switch (microphone & t-coil, t-coil only and microphone only) switch (right of center) and the 3-position (I—on, triangle—? and o—off) switch (right).

 

Click picture for larger view

 
Front view of the Danavox Model 727 PPX transistor body hearing aid showing the plain front—rather unusual for hearing aids of the day.

The battery door comprised the whole front of this hearing aid's case. It swung open to the left—also quite unusual for hearing aids.

Click picture for larger view

 
Right side view of the Danavox Model 727 PPX transistor body hearing aid showing the battery door release button (left of center) and the two-pronged receiver jack (right). Note that the impedance of the receiver was supposed to be 68 ohms.

 

Click picture for larger view

 
Left side of the Danavox Model 727 PPX transistor body hearing aid showing the hinge to the battery door.

 

 

Click picture for larger view

 
View of the inside of the battery compartment lid of the Danavox Model 727 PPX transistor body hearing aid showing the tubular battery holder (bottom).

 

 

Click picture for larger view

 
The battery holder swung out enough to insert an AA sized battery (positive end to the left) into the battery holder, the the holder was pushed back into place before you shut the battery door.


 

Click picture for larger view

 
View of the Danavox Model 727 PPX transistor body hearing aid showing the battery compartment with the battery in place. This hearing aid took a standard AA-sized 1½ volt battery.

 

Click picture for larger view

 
Close-up view of the inside of the battery compartment of the Danavox Model 727 PPX transistor body hearing aid showing a gain adjustment wheel (upper left) and the 3-position tone control (center) with settings for H—high frequency emphasis, N—normal and L—low-frequency emphasis.

It also displayed the manufacturer (Danavox) and where it was made (Denmark).
 

Click picture for larger view

 
Rear view of the Danavox Model 727 PPX transistor body hearing aid showing the wire pocket clip.

 

 

Click picture for larger view

 
Bottom view of the Danavox Model 727 PPX transistor body hearing aid  showing the model number (727 PPX) (left) and the serial number (57716) (right).

 

 

 

Click picture for larger view

 

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