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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?
twc
efner
99 posts
 
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.
davt's avatar
davt
500 posts
 
It might be helpful to know what equipment you have, including cables. I have a Belles 21A tube/hybrid pre with a Belles Reference 150A SS power amp and I leave my power amp on and turn off my pre and never have had a hum.
czbbcl's avatar
czbbcl
1,752 posts
 
I would not leave a tubed pre on 24/7 and only leave the amp on when you are going to be around it and in general not over night. I do on occasion leave my ss amp on overnight but as a general rule I turn it off. Having said that you should not get a loud hum when leaving the amp on with the pre-amp off. For qualifiers I have a cj tubed pre amp and cj ss amp.
jea48
4,324 posts
 

If the preamp has a mute feature, switch the preamp to mute before you shut it down. See if that helps.

Otherwise you best turn off the power amp first then shut down the preamp.
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