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

Showing 4 responses by arch7

Hello Miner42:
I had a P3 that had the same problem. Rega's response was the same. When the LP is playing there is much less hum. I was using a Jolida JD-9 phone stage (tubes) and I found with an upgraded power cord (LAT International AC-2) the hum was much less. I also noticed that once I gave up on trying to get rid of it, it mostly went away. Perhaps one of those audio mysteries like cable break-in. Once everything settled in it was much better. I'm using a Rega RB1000 arm on an LP12 with a Graham Slee Reflex phone pre and it's dead quiet. Maybe the upgraded cables in the RB1000 make a difference or maybe it's the preamp.

Have a little patience and perhaps it will improve.
Hello Miner42:

If you upgrade the power cord start with the preamp. Do you have a local dealer? They should lend you a cord or 2 to try, hopefully ones that are broken-in. You would hear immediately if it makes a difference or not with the hum. Whether or not it helps the hum it should improve your overall sound especially if you're using a stock cord now. Then the can of worms if officially open. Power conditioner? Upgraded power outlet in the wall. Dedicated circuits. Nuclear reactor in the basement.... it's endless.
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.