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

Aladdin Model 50 [Mod] Uni-Pak Vacuum Tube Hearing Aid

The Aladdin Model 50 [Mod] Uni-Pak vacuum tube hearing aid was a three vacuum tube hearing aid manufactured by the Aladdin Hearing Aid Manufacturing Co. of Minneapolis, MN in 1945.

Aladdin Vacuum Tube Hearing Aids was established in Schenectady, NY in 1940 and sold to a businessman early in 1942. This man died a few months later. It was then purchased by Johnston Brothers of Minneapolis, MN. They used the name "Aladdin Hearing Aid Manufacturing Co" but also apparently used "Johnston Brothers" as shown on this invoice. The Aladdin Model 50 sold for $122.50 on October 25, 1945 according to this invoice. In 1946, the Johnson brothers changed the name to Goldentone.

This attractive royal blue hearing aid measured 5⅝" x 2˝" x 1 1/16" thick (14.4 x 6.3 x 2.7 cm).

Without batteries it weighed 4.9 oz. (140 g). With batteries is weighed 9.0 oz. (256 g).

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Front view of the Aladdin Model 50 [Mod] Uni-Pak vacuum tube hearing aid showing the two vertical microphone slots (upper left). The cord on the left goes to the external microphone and the cord on the right goes to the earpiece (receiver).
 


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Top view of the Aladdin Model 50 [Mod] Uni-Pak vacuum tube hearing aid showing the black volume control/on-off switch in the center. This was the only control on this hearing aid.

 

 

 

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Left side view of the Aladdin Model 50 [Mod] Uni-Pak vacuum tube hearing aid. Note the wire pocket clip on the side and the wire going to the external microphone (lower left). This hearing aid was unusual in that it had both and internal microphone and an optional external microphone.

The external microphone wasn't easy to "plug in" or "unplug". To do so you had to open the back of the hearing aid and unscrew the blue connector in the top right corner of the circuit board (see below).

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Close-up view of the top right corner of the circuit board inside the Aladdin Model 50 [Mod] Uni-Pak vacuum tube hearing aid. To disconnect the microphone, you unscrewed the screw in the center of the dark blue plastic connector.

Since there are no switches or relays, it seems that the internal microphone was always active even when the external microphone was connected.

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Close-up view of the front of the external microphone for the Aladdin Model 50 [Mod] Uni-Pak vacuum tube hearing aid.

The microphone was very light for its size, weighing only 0.7 oz. (22 g).

It measured 1⅞" in diameter and ˝" thick (4.8 x 1.3 cm).

 

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Close-up view of the back of the external microphone for the Aladdin Model 50 [Mod] Uni-Pak vacuum tube hearing aid. You pinned this microphone on to your clothes in a convenient spot.

 

 

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Right side view of the Aladdin Model 50 [Mod] Uni-Pak vacuum tube hearing aid showing the wire pocket clip and the receiver cord coming out of the top corner (lower right).

 

 

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Rear view of the Aladdin Model 50 [Mod] Uni-Pak vacuum tube hearing aid. One of the unusual things about this hearing aid case is that there are absolutely no manufacturer's marks (name, model, serial no. etc.) anywhere on the case.

The external microphone cord is at the top left and the receiver cord at the top right.
 

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Bottom view of the Aladdin Model 50 [Mod] Uni-Pak vacuum tube hearing aid showing the battery door hinges.

 

 

 

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Right side view of the Aladdin Model 50 [Mod] Uni-Pak vacuum tube hearing aid showing how the back (battery compartment door) swung down from the top.

 

 

 

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Inside rear view of the Aladdin Model 50 [Mod] Uni-Pak vacuum tube hearing aid showing the electronics in the top half and the batteries in the bottom half.

 

 

 

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Close-up view of the back of the circuit board of in the Aladdin Model 50 [Mod] Uni-Pak vacuum tube hearing aid. This is what you saw when you open the back up. The center vacuum tube is a Raytheon CK 509 AX and the one on the lower right is a Raytheon CK 505 AX.


 

 

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Close-up view of the underside of the above circuit board of the Aladdin Model 50 [Mod] Uni-Pak vacuum tube hearing aid showing the shiny round microphone (bottom left), the volume control (top center) and the third vacuum tube is a Raytheon CK 502 AX (right). Note that all the vacuum tubes are soldered in place. They do not have plug in bases.

 

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View of the lower inside half of the Aladdin Model 50 [Mod] Uni-Pak vacuum tube hearing aid showing the blue 30 volt "B" battery (left) and the smaller 1˝ volt "A" battery (right).

The "B" battery was the National Carbon Co. (N. C. Co.) No. 430-E war hearing aid battery, while the "A" battery was a standard C-size battery such as this Eveready 1035 battery.

 

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Close-up view of the inside of the battery door of the Aladdin Model 50 [Mod] Uni-Pak vacuum tube hearing aid showing the label pasted there.

 


 

 

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Close-up view of the front of the receiver of the Aladdin Model 50 [Mod] Uni-Pak vacuum tube hearing aid. Note the three small sound holes in the center.

 

 

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Close-up view of the back of the receiver of the Aladdin Model 50 [Mod] Uni-Pak vacuum tube hearing aid. This is a Brush receiver. Brush receivers were crystal receivers, rather than dynamic receivers. Also, they had a unique way of "plugging" the cord into the receiver. the "plug" slid into two grooves on the back of the receiver here shown with the "plug" laying ready to slide into the grooves.

 

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Close-up view of the back of the receiver of the Aladdin Model 50 [Mod] Uni-Pak vacuum tube hearing aid showing the receiver cord "plug" sliding halfway into the grooves on the back of the receiver.

 

 

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Close-up view of the back of the receiver of the Aladdin Model 50 [Mod] Uni-Pak vacuum tube hearing aid showing the receiver cord "plug" fully connected.

On the left and bottom are the words "Pat. Pend." and on the top and right is the name "Brush".

 

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Close-up view of the front of the receiver (right) of the Aladdin Model 50 [Mod] Uni-Pak vacuum tube hearing aid and the hard clear plastic ear mold (left). The ear mold snapped to the nubbin in the center of the receiver.

 

 

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Side view of the ear mold snapped to the receiver of the Aladdin Model 50 [Mod] Uni-Pak vacuum tube hearing aid.
 

 

 

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View of the top of the box the Aladdin Model 50 [Mod] Uni-Pak vacuum tube hearing aid came in showing its name "Aladdin Uni-Pak Hearing Aid".

 


 

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View of the right end of the box the Aladdin Model 50 [Mod] Uni-Pak vacuum tube hearing aid came in showing the model no. (50) and the serial number (423) which matches the numbers on the hearing aid itself.

 

 

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View of the box the Aladdin Model 50 [Mod] Uni-Pak vacuum tube hearing aid came in.

The box measured 6" x 3" x 2 1/16" high (15.3 x 7.7 x 5.2 cm).

 

 


 

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