KT88 losing bias

Tubes Asylum

Questions about tubes and gear that glows. FAQ

I figure I'll ask the experts...
The bias on one of the KT88s in my VAC Avatar Super is slowly going down (I have to keep increasing the bias).
Is this a sign of the tube dying, presumably from old age? I've been searching the archives and I haven't found any definitive story on what actually happens when a tube gives up the ghost. This is assuming no fireworks etc which would be obvious.
I have found plenty on replacement KT88s though. Decisions, decisions.

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Topic - KT88 losing bias - Benb 16:18:48 04/07/07 (4)

It's time to replace the tube (and the mating KT88) /nt\ - tvad 17:06:50 04/07/07 (3)

On mating tubes -- question - jedinvest 18:07:33 04/07/07 (2)

Might depend on the amplifier too - dpy 07:00:08 04/08/07 (0)

Return the pair, otherwise how can anyone know the replacement matches? /nt\ - tvad 20:00:56 04/07/07 (0)

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