Using LDR3X Rev 2.F - I am having a balance problem, similar to one I had a year or two ago. The balance moves from right to left as the volume increases. Problem still there when I switched to different input impedances so I stuck with 20 ohms, where I get the loudest signal. I have a couple of spare LDR modules, which I think are good. I followed the procedure that worked last time - replacing the left shunt LDR, running recalibration, and playing music. This didn't fix it. Next I switched that "good" LDR to the right shunt, ran recalibration and then again the problem wasn't fixed. I pulled from my closet of cool crap an older Tortuga preamp (too old to have a number on the board - no switchable LDRs) and it worked fine - no balance issues. If I simply buy 4 new LDRs and put them in, should this solve the problem? Meanwhile this older unit sounds great and I even have 2 remotes for it.