I had a similar problem. I finally determined that the bearing was bad. In my case it required me to buy another arm to make the determination (after trying everthing else I could think of including lubing the bearing). I'm not sure if there's any other means to do so other than having a repair shop look at it. So you'll proably want to listen to other's inputs and try all other approaches such as Raul's above.
my tt skips
My tt skips and I own mostly new albums. I checked the tracking force with a gauge and the anti-skip is set to the same as the tracking force. It is an AR EB101 w/original arm and rega elys cart. I dont use thicker vinyl 180-200 grams. Do I need to oil the arm or set something? I am new to vinyl, my first tt. Any help would be greatly appreciated.....