If it's a two wire jack, the tip contact is signal, the sleeve contact is common ground (or minus).
If there is a coaxial wire, the center wire is signal and goes to the tip contact, the braided shield is ground and goes to sleeve contact.
If there are two ordinary wires, you need to measure with an ohmmeter / continuity tester which one is connected to the common ground (minus) - that will be the sleeve and the other wire will be the tip.
regards
3rq8 (Triarcuate)
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