It depends on the preamp.
I turn my Atma-Sphere MP-1 off and on twice a day to save the 18 tubes. Ralph says that if left on, the tubes need changing every 6 months. I try to make them last a year or more. It is on about 8 hours a day.
I think that most preamps are easy on their tubes and can last many thousands of hours.
I turn my Atma-Sphere MP-1 off and on twice a day to save the 18 tubes. Ralph says that if left on, the tubes need changing every 6 months. I try to make them last a year or more. It is on about 8 hours a day.
I think that most preamps are easy on their tubes and can last many thousands of hours.