1 Layer your samples with vinyl noise and crackle
2 Record samples to old tape at low levels - almost silent. re-sample and normalize 0db
3 run your signal through an old mixer, also at low levels
4 get a field recorder or any mic, play your samples really loud (loud enough) and record them from a different room
5 s. “Own samples on vinyl”-hack
edit: these are individual ideas btw. Of course, nobody will keep you from combining these 
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