Vacolite Model G Vacuum Tube Hearing Aid The Vacolite Model G vacuum tube hearing aid was manufactured by the Vacolite Company of Dallas, TX in 1942. The Model G measured 4½” by 2⅜” by ⅞” thick and weighed 6¾ oz. without the batteries. The Vacolite Model G was a 2-piece, 3 vacuum-tube model. It was similar to the Model F, but had lower gain. |  | Click picture for larger view | | |  | | |
| Front view of the Vacolite Model G showing the microphone grill. It consisted of 3 sets of 2 horizontal slots. This hearing aid used a crystal microphone. |  | Click picture for larger view | | | |
| Rear view of the Vacolite Model G hearing aid showing the pocket clip (upper center). |  | Click picture for larger view | | | |
| Close-up of the lower rear of the Vacolite Model G hearing aid showing the model and serial number. These were "scratched" on by hand to the right of the "No.", namely G-7645.
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| Top view of the Vacolite Model G showing the volume control. This was the only control on this hearing aid. There doesn't appear to have been an on-off switch (at least, you can't feel the volume control snap to the off position). |  | Click picture for larger view | | | |
| Close-up of the 3-pronged "B" battery plug (left) and the 2-pronged "A" battery plug (right). The Vacolite Model G required a 1½ volt "A" battery such as this Zenith A battery and a 33 (or 45?) volt "B" battery (such as this Zenith Z-30 45 volt "B" battery). |  | Click picture for larger view | | | |
| Back view of the crystal receiver of the Vacolite Model G showing how the receiver cord plug fits together. Crystal receivers were thinner, but bigger in diameter than the more common dynamic receivers. This one measured 1" in diameter. This receiver was made by Brush.
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| Back view of the crystal receiver of the Vacolite Model G showing how the receiver cord plug slid from the right into grooves on the receiver, rather than plugging in as was more common. |  | Click picture for larger view | | | |
| The receiver (left) and the ear mold (right) of the Vacolite Model G snapped apart. |  | Click picture for larger view | | |
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