XLR to RCA plugs or cable

I don’t think a phono cartridge to phono stage is close to -10dB.

@holmz @lohanimal There was no mention of gain of the phono preamp (input vs output). If the phono preamp has a RCA line output, then that output is generally speaking rated at -10 dBV (just like any other RCA output). If it has a balanced XLR output, then that output generally speaking is probably rated at +4 dBV (just like any other balanced XLR output). That’s the general consensus of RCA vs XLR outputs. Now of course the voltage of those two outputs will vary, but if we're going to categorize RCA and XLR outputs, that's how they're categorized (-10 dBV & +4 dBV respectively).

Differences Between Mic Level and Line Level

You’re right @dpop - I has read it as into the phono stage, rather than out of it.
(Sorry Mate.)

That Jensen isolator is making a lot more sense now in that context, but also I would try a Neutrik first, and then the OP already has the XLR cable in case they need the Jensen.

You can buy an interconnect from Morrow Audio, and choose which connectors you want.....one RCA and one XLR. I've used Morrow interconnects (both XLR and RCA) for years, and love them. I'd recommend the  MA4 interconnect which lists are $164 for 1 meter, you can even choose the quality of the connector. 40% sale on with SAVE40 code

@vthokie83 + 1

I would add Audio Envy to this list.  I had a 1M pair of O'Nestian interconnects made with XLR on the source end and RCA on the destination to run from my DAC to my headphone amp.  Price was < $200, if memory serves.  Very solid performers for the price point.