If you can afford it, you might consider a studio session with some musicians to recreate the sample you want to use.
GJ
Do you mean crackle, hiss, scratches, surface noise? Not a problem; lots of good samples out there, or make your own (nobody will sue you for sampling a locked-groove at the end of an LP.
Do you mean, analog, "warm," full bass and mid-range, not brittle or overly loud or compressed? Real instruments, or real grooves with less machine-like precision?