I also run a class A amp (Pass XA25) with a tube preamp. I have a dedicated room and music listening is a session. When I anticipate a session coming on I turn on the amp. It can cook throughout the day if needed. When time for the session I turn it off, wait a minute for the signal path to discharge, then turn preamp on, wait a minute for it to charge, then turn amp back on. The tube pre dos not take long be at capacity. Possibly too much trouble for some.
When session is spontaneous it turn equipment on in proper order and enjoy, the XA25 catches up.
When session is spontaneous it turn equipment on in proper order and enjoy, the XA25 catches up.