Is your turntable and tonearm properly grounded? Have you tried a cheater plug on your phono preamp and/or preamp to try to see if one is picking up a ground loop hum?
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When you changed the components around did you change the power cables on any components? One of the power cables might have a less than optimum ground that can cause hum. Is connected to the phono stage.
One thing I did on my system was to ground every component chassis/case to one single ground point on my power supply.
Even though I did not have a hum at the time, the resulting reduction in noise was noticeable.
I had to move my Phonostage away from my preamp and my dac both caused a loud hum when playing records. It all stared when I purchased a new dac and had to make room for it. I moved equipment around to make it more convenient and keep my analog separate from digital. That ended up giving me your same issue. I placed my Phono on top of my TT dust cover turned all on and no hum so I put it on its side next to the TT where it now live happily with the rest of my system.