Thank you for all responses. In my case I don't think the noise is due to out of alignment cartridge or excessively-loaded capacitance although it might be a possibility. I highly suspect it is due to dirty records as I can see dust all over the surface with my naked eye. The surface seems to be in pretty good shape without any scratches although one of the LP has a mark running across the circumference, not too sure whether it's a scratch or just a dirty mark which can be cleaned off. Although the intermittent crackles and pops are noticeable it is not really serious as it seems to be. Maybe my expectations are little high since I have been living with digital for all my life.
I will get the records cleaned soon. Thanks for all the useful feedbacks.
I will get the records cleaned soon. Thanks for all the useful feedbacks.