Rega hum


Rotel RC-1090 pre
Rotel RB-1092 amp
Rega P5, TT PSU, Exact cartridge.

Noticed this weekend an annoying hum in the background especially with nothing playing on the TT and volume up. What do I need to do to rid this hum? I realize Regas are grounded internally. BTW, table is completely stock. All equipment is plugged into a Rotel RC-1040 power conditioner. Thanks for all suggestion.
miner42
Try also different combinations of where things are plugged in. Most amps/preamps if the are separate units like to be plugged into the same source to prevent ground loop hum. Try that or try plugging the TT into a different outlet, even try running a long extension cord from another circuit just to test it.
I am pretty sure the hum is caused by EMI since I get it with table power off - just not sure which source is the culprit right now. All my equipment is plugged into a Rotel RLC-1040 power conditioner. With table off, amp & pre on, when I turn volume to 50% I can hear teh hum through each speaker which tells me the cartridge is picking up some interference.
Which power cord should I upgrade? The Pre? My TT has its own PSU. I did find that if I did not have the TT PSU plugged into the swithced outlet on my pre the hum diminished somewhat. It (TT PSU) is now plugged directly into a wall outlet. This may be as good as it gets since I can not locate my equipment from ther current locale.
Try eliminating the power conditioner. I've never met one that hasn't caused some problem or other