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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
miner42 OP
709 posts
 
It definitely has to do with the cartridge/phono section. With all power off accept the pre/amp and phono chosen, I get the hum when volume is turned up. I move the arm over and place stylus on an LP (not running), the hum is still there (thought activating the magnets in the cartridge might stop hum). I'll try placing the DVR cable box between amp & pre.
arch7
35 posts
 
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.
miner42 OP
709 posts
 
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.
arch7
35 posts
 
Then you might be back to trying an upgraded power cord.
miner42 OP
709 posts
 
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.
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