Four Hour Tube Amp Warm-Up

I always enjoyed the process of hearing things open up- I'd say 45 minutes is sufficient for the Lamm ML2 SETs and a couple or three sides of LP for the cartridge to really come into its own (after initial settle in which could vary depending on cartridge). My small vintage system running old Quad IIs with period glass (GEC KT 66s!) and restored Quad 57s is pretty much the same on warm up time. And you can clearly hear when these systems just bloom- everything opens up. 

I've been using various tube amps and preamps since the early '70s and can't say my experience decades ago is much different using then current ARC tube gear, but my sonic memory isn't that good. 

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.