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

Medexport V/O Model 3BYK Vacuum Tube Hearing Aid

The Medexport V/O Model 3BYK two-piece vacuum tube hearing aid was manufactured by the Moscow Hearing Aid  Plant for V/O Medexport of Moscow, U.S.S.R. in 1950.

The 3-vacuum tube Medexport Model 3BYK vacuum tube hearing aid measured 4⅛” by 2⅜” by 15/16” thick (10.5 x 6.1 x 2.4 cm). Without batteries, it weighed  5.4 oz. (152 g).

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Front view of the Medexport Model 3BYK vacuum tube hearing aid showing the black Bakelite case. The microphone grill is at the top. The design is of a candelabra.

 

 

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Close-up view of the upper front of the Medexport Model 3BYK vacuum tube hearing aid showing the microphone grill in the shape of a candelabra. Note part of the grill on the left side has broken off.
 

 

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Close-up view of the lower front of the Medexport Model 3BYK vacuum tube hearing aid showing the model number (3BYK).

 


 

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Top view of the Medexport Model 3BYK vacuum tube hearing aid showing the on-off switch (lower center).

 


 

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Left side view of the Medexport Model 3BYK vacuum tube hearing aid showing the control wheel (left).

This control is unmarked, but probably it was for the volume.


 

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Right side view of the Medexport Model 3BYK vacuum tube hearing aid showing the control wheel (right).

This control is unmarked, but probably it was for the tone. (Or I could have it backwards and this is the volume control and the tone was on the other side.)
 

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Rear view of the Medexport Model 3BYK vacuum tube hearing aid showing the pocket clip (upper center) and plugs (bottom).

 


 

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Close-up view of the center back of the Medexport Model 3BYK vacuum tube hearing aid showing the serial number (6949337) and other manufacturer's information (in Russian).


 

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Bottom rear view of the Medexport Model 3BYK vacuum tube hearing aid showing the receiver cord plug (left) and the battery cord plug (right) when plugged in.


 


 

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Close-up view of the bottom rear of the Medexport Model 3BYK vacuum tube hearing aid showing the receiver cord sockets (left) and the battery cable sockets right.

 

 

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Close-up view of the receiver cord plug (bottom) and socket (left side) of the Medexport Model 3BYK vacuum tube hearing aid. Note, the receiver cord only needed two pins, so two were unused.

 

 

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Close-up view of the battery cable plug (bottom) and socket (right side) of the Medexport Model 3BYK vacuum tube hearing aid. Note, the battery cable used all four pins—two for the "A" battery and two for the "B" battery.

 

 

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Close-up view of the battery cable plugs of the Medexport Model 3BYK vacuum tube hearing aid. The "B" battery plug is on the left and the "A" battery plug is on the right. As was true of all vacuum tube hearing aids, this hearing aid used a 1˝ volt "A" battery such as the Eveready 1052-P. It used a 45 volt "B" battery such as the Eveready 455-P.

 

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Close-up view of the two-prong "A" battery plug of the Medexport Model 3BYK vacuum tube hearing aid showing the two pins. Note the right one is larger than the left one to maintain proper polarity.

 

 

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Close-up view of the 3-prong "B" battery plug of the Medexport Model 3BYK vacuum tube hearing aid showing its 3 pins. The 3-pin arrangement meant you could only plug it in one way, thus maintaining proper polarity. By convention, "B" batteries had 3 pins although the battery only used 2 of them.

 

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Close-up view of the end of the receiver cord of the Medexport Model 3BYK vacuum tube hearing aid aid showing the pits at the end of the cord that plugged into the receiver. (The receiver and ear mold are missing.)

 

 


 

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