How do you know when preamp tubes go bad?

Over the last few days the sound quality of my system has diminished considerably. I'm using a tube preamp driving a SS amp.I've seemed to lost a lot of my my soundstaging.Any input would be greatly appreciated.

mfb3311-13-2002 5:16pm

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imin2u Details Discussions Posts This discussion Message User 392 posts 11-14-2002 at 02:31pm Copy Comment URL Report Comment Edit Delete I'm no expert, but I thought they started to "ring" at the start of their demise. The ringing would go away by tapping the chassis top but randomly return weeks later. I'm currently running an Audible Illusions 3A with white Amperex 6922 (NOS).
fatparrot Details Discussions Posts This discussion Message User 1,314 posts 11-14-2002 at 05:04pm Copy Comment URL Report Comment Edit Delete Watch for the upcoming FOX TV special, "When Good Tubes Go Bad!"
sidssp Details Discussions Posts This discussion Message User 1,077 posts 11-14-2002 at 07:24pm Copy Comment URL Report Comment Edit Delete I read somewhere that Victor at BAT said an old tube can be reactivated by feeding it a certain current at certain voltage. Does anyone know how to do that?
fujindemon Details Discussions Posts This discussion Message User 134 posts 11-14-2002 at 08:03pm Copy Comment URL Report Comment Edit Delete you know preamp tubes have gone bad when they call you at 2am asking to be bailed out of driving a solid state amp... some humor never hurts... this is not intended to stir tubes/ss shenanigans...to each their own

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