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New to tubes

I just got a Musical Fidelity X-pre preamp, which contains two tubes (KT-88's I think). How do tubes age? Will I hear a deteriation in sound? Or will this go so slow my ears will adapt to it, so I won't notice it? Or will they just quit working when there too old?
Basically: how do I know when it's time to change them?
Thanx in advance.
satch

Showing 1 response by tjbearman

tjbearman
40 posts
 
I think of changing tubes like changing oil. I do it regularly (once a year or so) whether they need it or not and certainly before they get 3,000 miles on 'em and get all black and sticky :)

Besides, it's fun to get a little bit different sound every year or so.

TJ
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