Zenith "Pacemaker PB" Behind-the-Ear Hearing Aid The Zenith "Pacemaker PB" behind-the-ear hearing aid was manufactured by the hearing aid division of the Zenith Radio Corp in 1965. It contained an integrated circuit with 8 transistors. It was about 1¾" long, ⅝" deep and ½" wide. |  | Click picture for larger view | | |   | | |
| Rear view of the Zenith "Pacemaker PB" behind-the-ear hearing aid showing the closed battery door, which also served as the on-off switch, (center right) and the unusual flat wheel volume control (bottom).
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| Side view of the Zenith "Pacemaker PB" behind-the-ear hearing aid showing the pulled-down battery door. This hearing aid used a No. 675 battery. |  | Click picture for larger view | | | |
| Bottom view of the Zenith "Pacemaker PB" behind-the-ear hearing aid showing the microphone port in the center of the bottom. |  | Click picture for larger view | | | |
| Bottom left side view of the Zenith "Pacemaker PB" behind-the-ear hearing aid showing the "Zenith" name. |  | Click picture for larger view | | | |
| Bottom underside view of the Zenith "Pacemaker PB" behind-the-ear hearing aid showing the model no./serial no. (PB016). |  | Click picture for larger view | | | |
| View of the Zenith "Pacemaker PB" behind-the-ear hearing aid in its original box. |  | Click picture for larger view | | | |
| Outside view of the original Zenith "Pacemaker PB" behind-the-ear hearing aid plain cardboard box. |  | Click picture for larger view | | | |
| End view of the Zenith "Pacemaker PB" behind-the-ear hearing aid box showing the motto of this aid—"Zenith Living Sound Hearing Aids". |  | Click picture for larger view | | | |
| Side view of the Zenith "Pacemaker PB" behind-the-ear hearing aid showing its size. (Each mark on the ruler is 1/16".)
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