Hi. I am by no means a tech, so I posed exactly the same question directly to Blue Circle Audio when I purchased their BC21 preamp and BC22 amp late last year.
Their advice was to leave the components off when not in use to reduce wear on tubes and other parts, and to reduce the chance of damage during a lightning strike. They said a 15 minute warm up period was all that was necessary for good results.
On the other hand, in the manual for my Kora Hermes they specifically say that the DAC was designed to be left on all the time, because their circuits economize the life of the tubes so they last 10,000 hours.
I guess the best thing to do is to consult your manual or contact the manufacturer. Good luck.
Their advice was to leave the components off when not in use to reduce wear on tubes and other parts, and to reduce the chance of damage during a lightning strike. They said a 15 minute warm up period was all that was necessary for good results.
On the other hand, in the manual for my Kora Hermes they specifically say that the DAC was designed to be left on all the time, because their circuits economize the life of the tubes so they last 10,000 hours.
I guess the best thing to do is to consult your manual or contact the manufacturer. Good luck.