Hi Kevin; According to McCormack Audio's owners manual(s), a solid state amp will sound good within 20 minutes of being turned on. Many, many audiophiles disagree with this, and in fact mine does sound "good" within 20-30 minutes, but not "great". SF recommends turning their tube amps off if they are not going to be used within a couple hours or so. Turn it off overnight. Standby does reduce tube life. I leave my Sonic Frontiers Line 2 pre-amp in standby at all times it's not playing, and I have to replace tubes about once a year. I listen, on average, 4 hours a night. As the tubes gradually "wear", music gradually becomes brighter, harder, and more fatiguing. I've gone through this twice now, and have just decided to replace pre-amp tubes once a year. Standby also decreases tube life in amps, and you just have to decide on a procedure that works for you regarding tube life versus music quality. Happy Listening. Craig.
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