What TV (type, size) do you have?
The difference between the most expensive and cheapest S-Video cable is barely noticeable under normal conditions (length of cable under 2 meters/6-7 feet).
At the same time the difference between the video composite cable (yellow jack in your case) and S-Video should be noticeable.
You are right the S-video cable took over the job of transfering the video to the TV (you don't need to have the yellow jack plugged in).

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