Dahlberg Model D-13 "Magic Ear II" Behind-the-Ear Hearing Aid The Dahlberg Model D13 "Magic Ear II" hearing aid was manufactured by The Dahlberg Co. of Minneapolis, MN in 1957. This was only Dahlberg's second BTE hearing aid. BTE aids at this time had external receivers, just like body aids had. The receiver measured 13/16" (2.0 cm) in diameter and was ⅜" (1.0 cm) thick. The body of the hearing aid was 1 11/16" x ˝" x ⅜" (4.3 x 1.3 x 1.0 cm) and weighed 0.5 oz. (16 g) without battery or ear mold. |  | Click picture for larger view | | |  | | |
| The Dahlberg Model D13 "Magic Ear II" hearing aid came in two varieties—a gun-metal gray version (left) and a silver-colored version (right).
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| Front view of the Dahlberg Model D13 "Magic Ear II" hearing aid showing the microphone port (the small hole upper center). There were left and right ear models. This one is for the left ear.
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| View of the bottom side of the gray version of the Dahlberg Model D13 "Magic Ear II" hearing aid showing the Dahlberg name (left) and the model "Magic Ear II" on the right.
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| View of the bottom side of the silver-colored version of the Dahlberg Model D13 "Magic Ear II" hearing aid showing the Dahlberg name (left) and the model "Magic Ear II" on the right showing that these two were versions of the same model in spite of there several differences.
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| Rear view of the gray version of the Dahlberg Model D13 "Magic Ear II" hearing aid showing the front of the receiver (right).
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| Bottom view of the gray version of the Dahlberg Model D13 "Magic Ear II" hearing aid showing the dark brown volume control knob. This may be the only BTE aid that used a knob rather than a volume control wheel.
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| Bottom view of the silver-colored version of the Dahlberg Model D13 "Magic Ear II" hearing aid showing the silver-colored volume control knob.
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| Back view of the Dahlberg Model D13 "Magic Ear II" hearing aid showing the battery door (closed). It swung up from the bottom.
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| Close-up view of the Dahlberg Model D13 "Magic Ear II" hearing aid showing the battery door opened. This hearing aid took a No. 400 mercury battery.
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| Close-up view of the gray version of the Dahlberg Model D13 "Magic Ear II" hearing aid showing the battery door opened revealing the serial number (V952) hiding inside.
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| Close-up view of the silver-colored version of the Dahlberg Model D13 "Magic Ear II" hearing aid showing the battery door opened revealing the serial number (G920) hiding inside.
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| The receiver was connected to the body of the Dahlberg Model D13 "Magic Ear II" hearing aid via a short stiff cord that plugged into the receiver.
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| Front view of the receiver of the silver-colored version of the Dahlberg Model D13 "Magic Ear II" hearing aid. This receiver was considerably smaller than the receiver used in the gray version. (For comparison, see second picture from the top.) It measured ⅝" (1.6 cm) in diameter in contrast to the larger receiver that measured 13/16" (2.1 cm).
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| Not only was the receiver of the silver-colored Dahlberg Model D13 "Magic Ear II" hearing aid smaller, it also was hard wired to the cord and could not unplug as did the larger receiver (see below).
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| The receiver of the Dahlberg Model D13 "Magic Ear II" hearing aid showing the two-pronged plug and jack.
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| Just like with body hearing aids, the ear mold snapped onto the nubbin in the center of the receiver (shown here separated).
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| The inside of the lid of the case of the Dahlberg Model D13 "Magic Ear II" hearing aid showing the Dahlberg name. Note that Dahlberg was owned by Motorola Inc. between 1959 and 1963. Thus, either this is not the original case, or more likely, this hearing aid was still being sold two years later in 1959.
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| The Dahlberg Model D13 "Magic Ear II" hearing aid in its case. |  | Click picture for larger view | | | |
| Outside view of the Dahlberg Model D13 "Magic Ear II" hearing aid case. This case was rather small measuring 3 1/16" x 2⅜" x 1 3/16" (7.8 x 6.0 x 2.9 cm).
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