Ok, I replaced the amplifier. Now it works just fine. I must had done something wrong in my first installation.
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or it could be simple coincidence. I had the power supply of my Lexicon DC-1 blow out and all I did was plug it in. I think it was just ready to go, which may be the case with your amp.
I seems peculiar though that you still get some sound through the bad channel - I would think it's something very minor, but I just can't suggest what it might be.