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.
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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). |
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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. |
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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. |
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Left side of the Danavox Model 727 PPX transistor body hearing aid
showing the hinge to the battery door.
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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).
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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.
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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. |
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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).
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Rear view of the Danavox Model 727 PPX transistor body hearing aid
showing the wire pocket clip. |
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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).
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