How long can preamp tubes last?


Good evening Ladies and Gents
Trying to learn! I have had a Shiit Freya + preamp for about 1 year now, and it has about 450 hours of play time, with original tubes.
Is it time to change the tubs? What tubes/brand would be recommended to purchase? 
As far as budget, I really have no idea what they cost.
Also, what does the expression" rolling the tubes" means?

Any information would be welcome.
Thank for reading.
rockanroller

Showing 1 response by wolf_garcia

450 hours a year? My cables take longer than that to break in (so the manufacturer says). I've had the same NOS GEs in my Freya for a long time (2 billion hours or so), and the interesting and somewhat unique thing about the Freya is that you can check the honesty or whatever of the tubes instantly...simply switch the mode to passive or FET and match the gain...presto el checko. If the tubes (relatively) sound like mush possibly change them, or for you, get new ones anyway in 2036.