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tomNJUSA t1_j6j7h0n wrote

They used to have "air tubes". You plugged in a two pin plug that was just a hollow tube. No electronics. This would connect to bigger tubes below the seat. The sound would be sent through the tube. They actually had a few different channels. The sound was OK but the best part was all of the second hand smoke. The 70's were fun.

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pedroah t1_j6l14ia wrote

Aka it works like your doc's stethoscope

The two pin electric earphone jack might be a carry over from this two hole air tube system. I've seen this air tube setup even in the early 2000s.

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