Many things can cause hum in an audio system - it's not always a ground loop. What do you mean when you say the problem is only with analog? Do you mean only the phono stage, or any analog input?
It would be helpful if you tell us more about the equipment you are using.
Is this a new problem with existing equipment, or is the gear new to you?
It would be helpful if you tell us more about the equipment you are using.
Is this a new problem with existing equipment, or is the gear new to you?