The latest addition to my listening room is literally a 'heaven sent' full function preamp from VAC - the Signature Triode MKII. According to the manual, burn in period is 150 hours and I have probably reached 120 hours and the transformation from first hour to know is quite startling and revealing. It is a very musical preamp from the onset and while the days and hours go on, the sound just keep blooming into something I rarely experience before from a preamp with just its stock China/Russia made tubes. The sound is just magical , with an incredible portrayal of the soundstage of any recording. It is devoid of any harshness and for sure, does not create listening fatigue.