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Also greetings from Germany, @strukturforscher ! I own an A200 and cannot confirm the bugs that you describe, neither the rising ground noise nor the pop when you switch to BT.
Well, I don't know for your eyes.
But Multi Instrument FFT peaks are somehow truncated on the plot sometimes.
But look at the table in bottom right:
THD is a bit higher than H3, which is -36.79dB, or 22.08dB lower than the fundamental (-14.71dB).
So the THD figure of -21.2dB seems realistic.
Besides for some super low sensitivity speakers, does one need a 50W (8ohm) amp for desktop use? I would trade a bit of that for lower noise, so higher sensitivity speakers have less chance of tweeter hiss.
Yes I agree, going below 50wpc gets a little strained imo on quite a few choices of speakers. Finding a pair of speakers above 90db sensitivity for a reasonable price is not easy. Most speakers seem to be around 86-90db, I have a pair at 88db and going any lower than 50wpc would be fruitless.