Oticon 580 PC Behind-the-Ear CROS Hearing Aid The Oticon 580 PC BTE CROS hearing aid was manufactured by Oticon A/S in Denmark in 1967. It had 3 transistors. This hearing aid came in three sub-models—the "U", "S" and "PC". The "S" model was for severe losses, the "U" model was for moderate losses while the "PC" model (shown at right) was for minor hearing losses. A CROS hearing aid is used by someone with single sided deafness.
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| View of the Oticon 580 PC (deaf ear piece). This part was placed over the deaf ear and wired across to an amplifier in the hearing ear in order to pick up sound on the deaf side and transfer it to the hearing side. The battery door on this part is sealed shut as it doesn't need any power.
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| View of the Oticon 580 PC (deaf ear part). This part only contained a microphone. Interestingly, the microphone was placed on the bottom of the case facing down (black circle on bottom right).
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| View of the Oticon 580 PC (hearing ear part). This part contained the hearing aid amplifier. Notice the volume control (bottom left) and the battery door opened. It used a No. 675 battery.
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| An open type ear mold is used on the hearing side (shown right) so that sound can be received naturally in the good ear as there is no microphone on the hearing aid itself. Brochure giving more details about the Oticon 580 line of hearing aids.
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| View of the Oticon 580 PC showing its size.
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