my sl 1210 is louder on the right channel

Did you check the Azimuth??

No tubes, although thats my next step, i use a cambridge A1 through a 640p and i have checked and re checked all leads and connections, the azimuth looks fine but as i have the sumiko headshell i can at least play around with that, it's not that it's quite on the left channel as some records come out louder. Joni mitcell's hissing of the summer lawn, steely dan's royal scam and utopias oops wrong planet. i have swapped the phono leads from the deck over but that just changes channels, i suppose what i need to do is swap the connections on the cartridge to hear the mix change say on led zep 2 when the drums come out of the left channel and the guitar kicks in on the right after the the middle section, you know the swirley stereo wierd section. if it's clear then it just could be the way it's recorded, if it's muddy then i will know if there's something wrong. I am really confused.