It can happen to any tube. If the tube makes it past 250 hours it'll probably last it's expected life.
You might want to look at tube dampers. I recommend them but with reservations. They can create a more quiet background although I couldn't say they improve the sound. If they do it's not very much.
On the negative, I think they may give tubes damper memory meaning your tube is more likely to get noisy or microphonic if after having damped it for a month you remove the damper. This can seriously impair your tube rolling.
The reason for using them is that they may increase your tube longevity and may also prevent your tube from becoming noisy or microphonic oin the first place. I've also successfully used dampers to quell microphonic tubes that I would have otherwise discarded.
I'd use them on expensive tubes if I liked the sound and I was pretty sure I was going to keep them, but no tube rolling after that.
You might want to look at tube dampers. I recommend them but with reservations. They can create a more quiet background although I couldn't say they improve the sound. If they do it's not very much.
On the negative, I think they may give tubes damper memory meaning your tube is more likely to get noisy or microphonic if after having damped it for a month you remove the damper. This can seriously impair your tube rolling.
The reason for using them is that they may increase your tube longevity and may also prevent your tube from becoming noisy or microphonic oin the first place. I've also successfully used dampers to quell microphonic tubes that I would have otherwise discarded.
I'd use them on expensive tubes if I liked the sound and I was pretty sure I was going to keep them, but no tube rolling after that.