integrated amp problems

i have a cheap Yaqin MS-20L integrated tube amp and need some possible solutions to a problem. i noticed over the past 2 weeks that the center image of music was pulling to the left side. well today i did some testing and surely enough the left side is 3db louder than the right. i measured with a test tone and a spl meter 1 inch from each speaker's cone. i swapped everything from left to right{speakers,cables,ic's,all tubes} and the left channel still has the 3db gain. i also noticed there is a little fuzz when i gently play with the volume control. any ideas on what the issue is??