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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 rajivhifi

rajivhifi's avatar
rajivhifi
57 posts
 
There was a youtube video made by Paul of PS Audio last week where he recommends changing the tubes every 6 months if not a year. The advise I have heard here suggests they usually last a very long time. Kind of different schools of thought, though I honestly don't know which is correct. May have to be your own judge. 
https://youtu.be/HdNqD_dVBR4
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