I know nothing about Lear Jets
You mentioned 8-tracks, and I believe William Lear and Learjet Corp. designed the 8-track tape.
I was wanting to avoid spending money on a cable that was not needed.
In this hobby, we audio-enthusiasts try different combinations of cables and equipment. We're constantly in search of the best audio reproduction we can achieve with our gear. Many of us simply use our ears to determine what sounds best to us in our environment. It's all very much a learning experience.