Return option is recommended, especially Phono, you can read all you want, they sound this way in that system, that way in yours.
I had a highly regarded McIntosh SS C-28 Preamp, and a TT with an optional dinky built in phono preamp. I actually preferred the TT’s built in to the C28.
Then I bought my beloved McIntosh Tube Tuner/Preamp mx110z. Great Phono (2 inputs). I use a SUT step up transformer for MC with PASS for MM, to send all 3 of my tonearm/cartridges (MC,MM,Mono) to mx110z’s phono.
Personally, especially with return option, I suggest you try a Tube Preamp with Phono(s), which gives you options to try tubes with any or all other components that are perhaps going thru an integrated amp.
I like Vintage, eBay search just now, many with returns, including one mx110z listed. Yes those old RCA jacks need a good cleaning, true of most vintage,
https://www.ebay.com/sch/i.html?_from=R40&_trksid=p2334524.m570.l1311&_nkw=vintage+tube+prea...