Humming?

change stock cartridge for high output mc cartridge such as goldring eroica.

Here is an easy idea. Try adding a ground wire from your preamp to ground.

What cartridge are you using (some carts such as Grado are especially susceptible to hum)? When you say you have a ground wire connected from the turntable to the phono preamp, where is it connected at the turntable end? Do you also have a ground wire running from the tonearm to the Creek? Is there a ground connection on your preamp to which you can run a ground from the Creek to the preamp? Hum problems can be very tricky to solve (as you're finding out). You might try starting from scratch with NO ground wires connected and then add one at a time, in various combinations. Sometimes it works best to leave ground wires DISconnected. Good luck, Dave