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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 mijostyn

mijostyn's avatar
mijostyn
8,234 posts
 
Rock, trust me on this. You will absolutely know when a tube goes bad.
If the preamp sounds good. Leave it alone. It never hurts to keep a spare set of tubes for when the tube, tubes do go bad. Do yourself a favor. Do not get started tube rolling. It will drive you crazy.
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