Henry53, I see that you are relatively new to Audio Science Review. The reason this site exists is to discuss the objective (i.e. measurable) differences in audio equipment. So, almost by definition, any sonic differences that are claimed that are not measurable are “crazy”, or at least misinformed.Their are lots of audiophiles who love analogue, if you only look at measurements then this is crazy.
Amir’s response about the distortion differences between a tube amp and a DAC like the Qutest would be considered the consensus view here given what we know about the science of audiology.