I don't know what your problem is but I leave my amp on 24/7 and turn my pre off with no problems.ARCLS26 and 300.2 amp. Don't leave your tube pre on 24/7.Along with burning out the tubes it could present a hazard.
tubed preamp off and ss amp left on?
Why can't I leave my my ss amp turned on with the tubed preamp turned off? Loud hum occurs through speakers with this condition. When I had a ss preamp I could leave the amp powered all the time with the pre off. I would leave all powered up but concerned about the preamp tubes wearing prematurely. Is it a reasonable conclusion that I could leave everything powered on all the time and just change the tubes once per year?