NAD C275BEE break in period?

Once any electronic device reaches its operating temperature it is good to go! That may take 20 minutes or several hours! The idea that an electronic device sounds "better" over extended time (days, weeks, months) is totally erroneous - contrary to what the "golden ear" crowd claims! Spoken as a longtime owner/user of many electronic components, both tube and SS.

I do own several older NAD components: an integrated amp, a preamp and a preamp/tuner. Excellent affordable products. 

Not sure about that.  Totem Acoustics, for example, recommends 100 hours or more of easy going on many of their speakers to break them in.

I tried turning up a sub of theirs that I acquired, and it started making mechanical noises.  After break in, it was fine.