Hum coming from Turntable

Has this hum always been present, or did it recently appear?
What are you using for a phono stage, and how did you establish that’s not the problem?

Cleeds….just bought the TT recently, i had 3 phono stages to swap out to see if i can back track the problem, with the same results.  It’s for sure the noise is coming from the TT or phono cable. 

Just how loud is the hum? How is your TT connected to the phono stage - balanced? Unbalanced? What cartridge are you using? Have you tried another?

My hum was solved by using better shielded RCA cables.

Easy to diagnose if you have spare RCA's to try out.  

My tonearm wiring insulation became worn, made a slight intermittent hum, wiggled the wire, found it, being re-wired now.

you can use any common wire for a separate ground wire, thus you can substitute any interconnect cable you know does not hum to prove your phono cable is not the problem (or is, unlikely). you can use the phono cable for an interconnect (omit the ground attachments, another way of proving it’s not the cable.

cartridge wires: while on, simply touch end of joint of the wire on the pin (making a good connection) with a small plastic handled screwdriver. one at a time. hum changes? goes away? then remove with needle nose pliers, tighten, re-install. Or, just remove/tighten/reattach, never hurts to be sure.

keep in mind: whenever you move a cable or any piece of equipment, the other end? adjacent cables both ends?