I will first see if the turntable is setup properly with the tonearm and cartridge -- vertical/horizontal position of the tonearm, cartridge position, and tracking force/anti-skating. Also, I will think of having some isolation device.
Assuming your cartridge is a decent MC, I would make sure whether the needle is either worn out or bent.
Your preamp seems to be decent enough, so as others suggested, I will think of upgrading to a more powerful amp.
Assuming your cartridge is a decent MC, I would make sure whether the needle is either worn out or bent.
Your preamp seems to be decent enough, so as others suggested, I will think of upgrading to a more powerful amp.