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Preamp tubes in an SWR?

I have an SWR sm400s that I love. I've had it for probably 12 years or so no...and the preamp tube is finally, really, truely dead. Anybody have any experience with what sounds good in these amps? I actually get a fair amount of midrange grit out of it, which always surprises people, so something that will enhance that is what I'm really goin for.