Is ground noise really normal? If so, why?


I was playing my turntable for my kids tonight and remembering how amazing it is. But the ground noise between tracks was really bothering me and my kids asked what “that noise” was. I can’t imagine it’s not there during the songs. Am I missing something or is audible ground noise completely normal? I’ve had the tech over and I recall he thought it was normal. My turntable is a Clearaudio Performance DC and my phono preamp stage is a P-5xe Twenty. 

If this is normal, why? And are there companies out there that make phono stages that have no ground noise? It’s 2019 for godssakes. 

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Alas, my tone arm is not balanced as I didn’t know it was an option. So while the P5XE feeds the rest of my stack in balanced mode, the tonearm wiring is good old hummy. I’ve to a spool of low voltage wire on the way (remember how great it was to have old radio shack around for that sort of thing?), maybe I can get rid of the noise by grounding the chassis in a few more spots,
Well, it took a while (and longer for me to respond), but I figured out that it was my Ayre phono preamp. They repaired it and now it's 100%. And paired with a Viella V12!