Next thing to do is to swap the tubes from one channel to another, one pair at a time. This will allow you to isolate whether is a tube and if so, which tube.
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Whatever you do to diagnose the problem, make sure you don't start swapping in different brands or types of tubes. If you do this you might enjoy hearing the difference that tubes can make and you start trying a whole bunch of cool new choices. This leads the slippery slope down the tube rollers slide.
In truth different tubes are fun but it can get addictive, and expensive.
Thanks for the very helpful comments.
I just got a chance to get back to the issue and started following the advice from Jea48. After pulling out one of the right-side power amp tubes, resetting it, and playing music through the amp, that tube seemed to have a clear visual difference...it seemed to have an orange glow inside that the other tubes didn't, as if the metal parts were heating up like in a light bulb. The distortion was also more quickly obvious. Just to be sure, I swapped it with the tube in the same position on the left side and the distortion went to the other speaker.
I've actually had the thing for less than 90 days, and haven't really physically moved it around at all since I first set it up. I guess the tube was just defective. Maybe Jolida will send me a replacement. But I can't wait around for snail mail to get my stereo working, so I guess I'll just go buy a set at store tomorrow. And maybe I'll try a different brand and see if that sounds any different. :-)