@erik_squires
What part of the distortion signatures concern you? From what I see you might hear a slight 60 cycle hum at -76 dB's but everything else is under 90dBs. And there is some kind of harmonics in the noise signature (it is not random) so my guess it is intentional.
The 50 Hz chart looks OK too. There is a first order harmonic of -85 dBs at 100 Hz but everything else is under -100 dBs. You think you can hear that?
What part of the distortion signatures concern you? From what I see you might hear a slight 60 cycle hum at -76 dB's but everything else is under 90dBs. And there is some kind of harmonics in the noise signature (it is not random) so my guess it is intentional.
The 50 Hz chart looks OK too. There is a first order harmonic of -85 dBs at 100 Hz but everything else is under -100 dBs. You think you can hear that?