Beltone Harmony Vacuum Tube Hearing Aid The Beltone Harmony vacuum tube one-piece hearing aid was produced by the Beltone Electronics Corp. of Chicago, IL. The Harmony was Beltone's second one-piece vacuum tube hearing aid. It came out in 1946, two years after their Monopac. The overall dimensions are 4¼” by 2¾” by 7/8”. It weighed 5 oz. without the batteries. The Harmony came with either a magnetic or a crystal receiver. The crystal receiver is shown in the top picture. |  | Click picture for larger view | | |   | | | |
Top view of the Beltone Harmony showing the on-off switch/3 position (1, 2 & 3 dots) tone control (left), receiver cord jack (center) and volume control (far right).
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The picture at the right shows the opened battery with the 1.4 Volt (RM-4) mercury cell for the A battery, and the space for the larger 30 Volt (type 413) B battery. It was the smallest 30 volt "B" battery on the market at that time.
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| Note the green dot on the back of the case at the right, diagonally above the screw hole. A green dot in this position indicated the aid was set up for a crystal receiver. You can see a corresponding indentation on the left. When this indentation was painted green, it indicated the aid was designed to use the magnetic receiver. |  | Click picture for larger view | | | |
| The two receivers are shown here for comparison. The magnetic receiver is on the left and the crystal receiver is on the right. A magnetic receiver is basically a tiny loudspeaker. |  | Click picture for larger view | | | |
| This is the Beltone "Phantomold," or what is referred to as a "Link." It was often used so that the rather large button receiver did not show in the ear. The plastic tubing connected the receiver through a tube up to an ear mold. The button receiver was hidden under the person’s collar. These links are still used by broadcasters to hide the in-ear device. |  | Click picture for larger view | | | |
| A view of the Beltone Harmony in its original box. |  | Click picture for larger view | | | |
| A view of the Beltone Harmony case. |  | Click picture for larger view | | | |
| The manual that came with the Beltone Harmony. If you are interested, you can read this manual. |  | Click picture for larger view | | | |
| Here is the receipt for the original purchase of this Beltone Harmony hearing aid. It cost $160.00 in 1947 when it was sold. Note that the receipt shows the model as "magnetic". This particular hearing aid used a magnetic receiver rather than a crystal receiver.
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