It may not be static or the turntable. Do you have other sources? How do they play. Tightening the ground lug is easy. As millercarbon suggests, remove the screws holding the cover and tighten the nut holding the ground lug. It is probably a 5/16 or 3/8 wrench. I would remove all the tubes and clean the pins lightly with 4-0 steel wool then re-seat them.
Put a ground cheater on the amp that hums and see if that stops the hum. If it is a ground loop that will break it.
There are other sources of "pops" besides static from bad record, bad styli, overloaded phono stages, bad connectors and so forth. You have to isolate the problem to a component and channel. This is best done with the system set up and in place. Breaking it up and taking individual units to a tech may not solve the problem unless you are sure you have isolated it to one unit.
Put a ground cheater on the amp that hums and see if that stops the hum. If it is a ground loop that will break it.
There are other sources of "pops" besides static from bad record, bad styli, overloaded phono stages, bad connectors and so forth. You have to isolate the problem to a component and channel. This is best done with the system set up and in place. Breaking it up and taking individual units to a tech may not solve the problem unless you are sure you have isolated it to one unit.