I love this amp but you can only set the tube bias in triode mode and the settings stay put. I set the tubes at 40Mva. I do the same in ultralinear mode which is my favorite mode and the bias setting holds for about thirty seconds and then the meter fluctuates from 15Mva to 75Mva wildly. I sent the amp to Rogue and they said they couldn't duplicate the problem. Has anyone ever expierienced anything like this? I've swapped speakers and cables but had the same result. Any ideas?
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