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Well, since it is common knowledge, and my experience, that equipment turned on for longer time sounds better, I am pretty sure that the temperature is behind it. Hence my train of thought, however flawed may be, that increasing the temperature slightly more might be beneficial. It is hard for me to believe that engineers at Durob Audio, quite reputable outfit, would somehow missed the consequences of their design. Especially that their Primaluna line has so different approach.
Just a food for thought.
jjss49 and ebm - thanks for very insightful responses.