need good solid state amp to match my tube preamp

This is one of those situations where a trial of the specific combination would be ideal, though I can see how that might be hard when dealing with used gear. Tube linestages do not always "play" nicely with solid state amps--the results are somewhat unpredictable. Staying within the same brand is one way to avoid compatibility issues, particularly if you alread like the house sound of that brand.

It is hard to even roughly guess at what might work, particularly without knowing what kind of sound you are after. To me, the LS25 is a quite lean sounding linestage, so unless you want to emphasize that quality, one should stay away from leaner sounding gear. Rowland gear tends toward the warmer side (I personally don't like their Class D switching amps so listen to one first before considering such). I am a fan of the open and natural sound of Ayre amps, though these are not tonally on the warm side.

Have you considered having a machine shop make you some kind of tube cage?

Conrad Johnson MF-2500-A 240 WPC,Very powerful amp,yet it can do delicate too!I had one and had to sell it a few years ago due to financial reasons.Still regreting that decision! They come up used fairly regular,or call Spirit,bought mine there.Great service.Leans to the warm side slightly.Soundstage filled my room,went beyond the walls,very 3-D .

I should add that my CJ MF2500A was used with a tube preamp,Supratek Chardonnay.

I agree that the cj 2500A or cj premier 350 for that matter are very good ss amps. I used a cj premier 16 tubed pre with both amps and both were excellent. The 350 was the better of the two as it should be given the cost differential. You might consider McCormack or Pass as well.

Chuck

I think the ARC SS recommendation is valid. I also think that one of the older Krell FPB series amp would also work well as would the Pass units.