Definitely agree with Sean. The Op-Amp replacement will make a bigger difference than replacing female RCA mount. If I were you, I wouldn't bother with replacing female RCA mount.
I've replaced my CD player Op-amp and it's really day and night difference. However, it does change the tonal quality too. It will not sound the same as your previous op-amp. It's either you like it or you don't. I've put sockets in place so that I can switch to different op-amps without de-solder and soldering again.
You can search diyaudio on CD player clock mods and op-amps mod.
I've replaced my CD player Op-amp and it's really day and night difference. However, it does change the tonal quality too. It will not sound the same as your previous op-amp. It's either you like it or you don't. I've put sockets in place so that I can switch to different op-amps without de-solder and soldering again.
You can search diyaudio on CD player clock mods and op-amps mod.