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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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drewmb1 OP
66 posts
 
Definitely diggin' it!
Thank you all for your time and experience. Apparently, the ears have it. I was a mite suspicious before posting this and I swapped a set of electro-harmonix in for the telefunkens. While the telefunkens beat the electro-harmonixs originally it was no longer the case with age. What to do with the telefunkens that are now a bit slow. Alas.....

Sincerely,
drewmb1's avatar
drewmb1 OP
66 posts
 
I appreciate all your help and your suggestions. I was slow about posting the actual unit due to the unlikely chance that anyone would have one or have heard of it. It’s a handmade unit “Sheer Audio MM-77” that I purchased off ebay from Vintage Audio Labs.
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