18’ of single ended interconnects is a recipe for terrible hum and noise problems. 6’ is the practical maximum length for a single ended run. Do you have the option of running balanced cable?
You might be lucky. I used to have a 30’ run single ended from my preamp to mono blocks. With it running below the floor in the crawl space I used to have no issues. I then moved temporarily to a rental and had to run it on the floor and it was unacceptably noisy so I had to switch to balanced which I’ve been with ever since. You also want to make sure the output stage of your phono stage is up to driving a long cable (as cable LCR will increase with length) - what stage are you using?
Wow that’s a low gain phono stage (42dB/57dB) - so you could be in for some issues if you’re driving a long run off it. The stage itself is capable of driving a healthy 2-20V output but it would be good to know what’s coming in, what cartridge do you have? Hopefully MM or high output MC
OK that's a healthy 2mV output so the phono stage will be outputting 1.4V which is a good signal and should put you in as good a situation as you could hope to drive that long single ended run. If you had a .3mV output (i.e. typical low output MC) things might be more problematic -- anyway good luck!
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