Always try cheap fixes first. If all else fails, I suppose a Linn Linto would be nice! As nice a phono stage as it is, that's a rather pricey fix!
Here's something cheap and easy to try, if you are using a power strip:
1. Buy a hospital grade power strip (e.g., Wiremold)
2. Plug in components in this order, begining with the sockets closest to the power cord: power amp, preamp, CD player, other (e.g., phono stage, turntable).