Four Hour Tube Amp Warm-Up

Same here my Qualiton X200 is ready to go in 15 min.

My experience mirrors Tablejockey 

Agree with @tablejockey when it comes to tube gear, DAC's and digital components.   I do feel like solid state amps benefit from a 1 hour warm up period to sound optimal. 

@bolong "The solid state cd transport and DAC are of course kept on all the time."

I can see why you would do this if the equipment has a auto standby mode that kicks in (my Hegel H590 did but my H30 does not) but otherwise I fail to see the sense.  I'm not aware any any manufacturer that suggests leaving equipment powered up 24/7?  I would think you are only shortening the eventual life span of things doing this?  Just asking.  

My David Berning designed Linear Tube Audio ZOTL40 takes about 10 minutes to get there.

Funny you should bring this up. While the system sounds great after 20 minutes, I too have noticed that things get sublime after about 4 hours. All analog and tubes here.