Replacing my Krell FPB 600 amp with a tube amp


Im thinking of replacing my Krell FPB 600 amp with  tube amp . I really love the power and bass slam of the Krell FPB 600.Could i possibly find that with a tube amp? I was thinking of the ARC Ref 250 mono blocks. I am also using an ARC Ref 6 preamp. The only thing i can think of with this much power and bass slam would be the ARC Ref 750se. Any other suggestions and how would the ARC Ref 250s as compared to the Krell FPB 600. 
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I'd think about some Carver mono's and an awesome subwoofer (why put all the burden on a single amp?). Also, Carver claims to run his tubes in a manner that they last 20 years (instead of the usual two).
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jimcgrogan2....I have thought about that a while back . Maybe its time really consider that again. Thanks