Clearaudio Emotion hum/vibration in tonearm

I am a bit of a novice on vinyl. I've upgraded from a Project Debut(the entry level model) to a Clearaudio Emotion.Of late I've noticed a slight hum or buzz in the tonearm.Its stronger towards the cartridge assembly than the tracking weight.Is it a leaky earth or did I do something terribly wrong in the set up? To my ears the sound is good but I presume it could get better.
Its an all tube system in the process of stabilising. A home grown preamp feeding a pair of tube monoblocs hooked to a pair of ML Odysseys.
Appreciate any help/advice
I have the same TT. Lighten the tracking weight by a turn or two and that should solve the buzz.