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Is it a OK to leave tube pre-amps powede up 24/7

I’m relatively new to tubes in my hifi setup. Recently went from SS pre to tube ARC pre-amp and a Croft phono stage.

I have always kept all of my SS gear powered up 24/7(and still do), but I shut down my pre-amp and phono stage now after I am done listening for the day. I power them up at least a half of an hour before I put anything into play.

I would prefer to leave my tube gear on all the time, but am concerned about premature tube wear.

What would the tube folk here think about 24/7?

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noromance's avatar
noromance
9,771 posts
 
I have a Croft Micro 25R pre with phono stage and have used tubes for years. You do not have to leave them on. While they do sound a little better once warm, it it not a major improvement. If you did, and assume 5000 hours on the preamp tubes, you would get 7 months. Power amps somewhat less. 
noromance's avatar
noromance
9,771 posts
 
I should also add that you run an increased fire risk leaving them on all the time.
stereo5's avatar
stereo5
6,388 posts
 
What I do is keep mine off until a half hour or so before I am going to listen.  Preamp tubes should last 5-10,000 hours if not left on all the time.
ebm
9,311 posts
 
No its not ok power up 1 hr before listening 1/2 hr is ok as well.
hifiman5's avatar
hifiman5
1,832 posts
 
I guess I'm the dissenter here.  My modified CJ PV-12L is on 24/7 and my two 12AU7s have been in circuit for 18 months now and remain quiet and dynamic.  YMMV.

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