I leave my Plinius SA-102 on in A/B mode all the time. If I'm planning on listening in Class A I flip it into class A and let it warm up for about 20 minutes. If I simply start listening it is a bit harsh in the highs, relitively! Plinius seems to be very sensitive to this issue. If I do turn the amp off or unplug it for some reason it takes a couple days to get back to top performance.
Plinius warm-up
I've read on these boards the issue that the Plinius 8200 needs plenty of warm up time to sound right. This has been my experience also. I was wondering if other people are hearing the same specific qualities that I am. When the amp is not warmed up, the mids and highs play back level is lower, the lack of frequency balance giving the amp a bland sound. But the bass seems to be just fine compared to a warmed up amp. Same for you?
Don
Don