I have a channel imbalance which I am pretty sure has its source in either my tube preamp (more likely) or SS amp (less likely). I changed the tubes in the weaker (left) channel in the preamp but this did not solve the problem.
Another possibility could be the interconnect cables themselves. It's happened to me. Turnes out to be an intermitant short in one of the cables. Try switching the L and R cables and see if the problem changes channels
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