Beltone Mono-pac Model L "Lyric" Vacuum Tube Hearing Aid The Beltone Mono-pac Model L "Lyric" vacuum tube one-piece hearing aid was produced by the Beltone Electronics Corp. of Chicago, IL in 1952. It measured 2⅝” by 1¾” by ⅞” and weighed 13½ oz including the batteries. It used 3 vacuum tubes. The case was chrome front and back over a black plastic chassis—visible on all sides. Pocket clip is on the front in the center. The microphone grill (top right corner) is in the shape of a lyre—fitting with the model name of "Lyric". |  | Click picture for larger view | | |   | | | |
| Top view of the Beltone Mono-pac showing the 2-position tone control (labeled on the back as "1" and "2") (center) and the receiver cord jack (left). |  | Click picture for larger view | | | |
| View of the left side of the Lyric showing the volume control/on-off switch. |  | Click picture for larger view | | | |
| Rear view of the Model L showing the make and model engraved in the case "Beltone MONO-PAC Model L". Note the green dot on the left side above the hinge. |  | Click picture for larger view | | | |
| View of the battery compartment of the Beltone Mono-pac Model L showing the batteries in place. The "A" battery (center) is an RM-1 1.4 volt mercury battery, while the "B" battery is a 15 volt No. 504 E. The battery compartment door is hinged at the top and swings upward. |  | Click picture for larger view | | | |
| The Beltone Mono-pac Model L "Lyric" in its original case. |  | Click picture for larger view | | | |
| Outside view of the original case of the Beltone Mono-pac Model L.
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