Simplest. If your old pre has phono in, use it and run from Tape out to an input on new receiver. I'm doing it with my old Mac c30 to a soundstage. I'm told good older pre's have fine phono stages since there was no CD.
You'd have to buy a seperate phono preamp and plug your turntable into that (price range from $100/$200 up to thousands and thousands). The phono preamp will output a line-level signal which you can plug into any of the tape, CD, video, VCR, AUX, tuner, etc. jacks.
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