Cable quality OK, plug bad

The cable seems structurally OK to be (it had not yet open);
Unfortunately, the inside diameter of the Cinch (RCA) connectors vary so much that is plug out almost fall out of the socket, other so intimately, that is solid, take contact, that they pull off the back the jack from the unit to pull out (as seen during a ARCAM preamplifier, can I repair expensive could).
Since the behavior of other ports of other devices is analogous, probably not liegts to the socket.
I then deposited in the spare box the cable.