A question about tube longevity

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I have a Wright Phono preamp that uses (2) 12au7 and (4)6er5 tubes in the preamp. The tubes were last replaced in late Dec 2004. They are now noisy. The tubes in question are JJ Tesla 12au7 and sylvania 6er5. Is this a proper lifespan for these tubes?
Another question. The preamp has a power supply which also has tubes.(1 - 6fy7 & 1- 6x4) I am assuming that I should replace the power supply tubes when replacing the preamp tubes? Is that correct? Thanks for your help.

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Topic - A question about tube longevity - artemus 14:13:47 08/14/06 (6)

Re: A question about tube longevity - Jimmy 19:39:36 08/14/06 (1)

Or even some JAN Sylvania - Paully 06:33:19 08/15/06 (0)

Those tubes should last longer than that... - JJ Triode 16:31:09 08/14/06 (1)

Re: Those tubes should last longer than that... - artemus 17:55:43 08/14/06 (0)

Re: A question about tube longevity - Gusser 15:00:01 08/14/06 (0)

Re: A question about tube longevity - Shakey 14:22:09 08/14/06 (0)

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