by Shadowman82 » 03 Apr 2012 04:27
If it's not grounded properly you might hear a hum . As far as surface noise goes this can vary quite a bit from record to record but seeing you mentioned that some records have virtually no surface noise then it's not your equipment . If it was then you'd have allot of noise on all records , not just some .
At the very least you'll want to remove the dust off your records before you play them with a record cleaning brush , if you don't have one get one .