Beltone Mono-pac Model S "Symphonette" Vacuum Tube Hearing Aid The Beltone Mono-pac Model S "Symphonette" vacuum tube one-piece hearing aid was produced by the Beltone Electronics Corp. of Chicago, IL in 1948. It measured 3⅝” by 2¼” by ⅞” and weighed 6 oz including the batteries. It used 3 vacuum tubes. This hearing aid used a printed circuit. The case was a light tan-colored plastic front with a chrome back. Pocket clip is on the front in the center. The microphone grill (top center) is in the shape of a square with rounded corners and inlaid with a filigree pattern. Shown with the receiver is a phantom ear mold so the receiver button could be hidden below the collar making the ear mold much less visible. |  | Click picture for larger view | | |   | | | |
| Top view of the Beltone Model S showing the 2-position tone control (labeled on the back as "1" and "2") (center) and the receiver cord jack (right). |  | Click picture for larger view | | | |
| View of the left side of the Model S showing the volume control/on-off switch. |  | Click picture for larger view | | | |
| Rear view of the Model S showing the make and model engraved in the case "Beltone MONO-PAC Model S". Note the green dot beside the M (left just above the hinge). A dot here seems to indicate this aid used a magnetic receiver rather than a crystal one. |  | Click picture for larger view | | | |
| View of the battery compartment of the Beltone Mono-pac Model S showing the batteries in place. The "A" battery (center) is an RM-3 1.4 volt mercury battery, while the "B" battery is a 22½ volt No. 412 E. The battery compartment door is hinged at the top and swings upward. |  | Click picture for larger view | | | |
| The Beltone Mono-pac Model S "Symphonette" in its original case. |  | Click picture for larger view | | | |
| Outside view of the original case of the Beltone Mono-pac Model S.
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