I have decided to buy some vintage equipment to start enjoying my old LPs. I bought a 1980s vintage Kenwood truntable and Amplifier. I get low volume and not very crisp sound out of a record, so I am not sure if the problem is the cartridge or the AMP. I notice that when I put a finger close to the cartridge the Amp buzzes. If I press lightly on the arm when a record is playing there is no significant effect on the sound. I fixed the ground wire from the turntable to the Amp but noticed the Amp itself does not have a ground in the power line. Do I need a new cartidge or another Amp ? All advice welcome.