The most common "big" Jack/Plus is 5.5 x 2.1. However, sometimes you will come across a device that has more internal contact than 5.5 x 2.1 and it is 5.5 x 2.5. In my case it was an old Atari 5200 gaming console. The connectors and connectors are of good quality and I had no trouble soldering them.
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