Before you spend money on any cure, see if you can try it first. I had a serious problem with RF noise and the Audioquest RF Stoppers were a total waste. Most of the other suggestions seemed to help but the problem, as well as the cure was transient.
You may wish to also lift the ground, or, if you have cable tv, see if you have a circuit which does not share a ground with cable. Unfortunately, this option was not available to me.
What finally worked for me was a Linn Linto phono stage preamp. I tried about 4 other phono stages ranging from $100 to $1000 and only the Linto completely eliminated the noise. This may have to do with the unique electronics in the Linto.
Good Luck!
You may wish to also lift the ground, or, if you have cable tv, see if you have a circuit which does not share a ground with cable. Unfortunately, this option was not available to me.
What finally worked for me was a Linn Linto phono stage preamp. I tried about 4 other phono stages ranging from $100 to $1000 and only the Linto completely eliminated the noise. This may have to do with the unique electronics in the Linto.
Good Luck!