NAD C275BEE break in period?

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

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.