I am running Audiovalve Challenger 180 monoblocks and Allnic L3000 pre amp and never leave them powered up 24/7.
When I know I am going to be listening to music the system gets turned on a couple of hours before use even knowing both units have standby capability. I really don't have a good reason other than I don't want to chance a hardware failure that could result in serious system damage or maybe cause a fire.
As far as tube life my pre amp tubes always seem to last for several years and if I am questioning a tube I test it on my B&K 747 tube tester.
When I know I am going to be listening to music the system gets turned on a couple of hours before use even knowing both units have standby capability. I really don't have a good reason other than I don't want to chance a hardware failure that could result in serious system damage or maybe cause a fire.
As far as tube life my pre amp tubes always seem to last for several years and if I am questioning a tube I test it on my B&K 747 tube tester.