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 2 responses by middlemass

In 1988, I purchased a new VTL Deluxe from Audio Advisor. It came with Westinghouse Hungary (Tunsgram) 12AX7 and Tesla 12AU7. In 2013, I transferred those tubes over to the Rogue Atlas Magnum, replacing the stock JJ’s. So the Tunsgram and Tesla have lasted 33 years. Still going strong and still sound fantastic.