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Tube Life

I’m using a phono pre-amp with a pair of telefunken 12AX7 and one 12AT7. I purchased these tubes several years ago and they were rated at about 50% life. Are tube noise and tube rush the only reasons to change out tubes? Everything is silent and yet I can’t help but think that several years of use should indicate some sort of wear. Any experience or suggestions will be appreciated.
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Showing 1 response by mapman

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mapman
21,886 posts
 
Having an extra reference set to compare to is the best way to know for sure how another set is performing.

Or else you might just trust your ears enough to detect a problem that matters when it sneeks in.
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