several years ago, i decided i needed tubes. i replaced my linn kairn w/a rogue magnum 99. it had that tube bloom for sure - way too much of it. & the bass was mia. also, *extremely* microphonic. the bass issue (and excessive bloom?) was related, i believe, to an impedence mismatch - the rogue dint like driving two systems, the main one being fed from 5m interconnects. it was rated at 150 ohms output impedence; my experience, and my simple test crossing the outputs w/resistors, indicated its output impedence was likely closer to 2.5kohms. thank god i bought it used, so i could sell it w/o financial loss!

perhaps in a system w/short ic's between amp & pre, it wooda done better.
next up was a stock cary slp-98l this was a pre i could live with. and it's beautiful. beat the rogue in all aspects. much more neutral (which cary gear isn't noted for, afaik). it wooda been a keeper, but i had to try a melos preamp. the music director was so much better in all respects than anything i'd ever heard, i sold the cary, even tho i was in love w/the cary's aesthetics. so, i'd have to recommend a melos ma333r/music director. upgrades by m.a.r. will make it even better. or, check out dodd audio's top preamp - supposedly these will give the melos' a run; i am awaiting feedback from someone here on the ac that owns a stock ma333 & has yust purchased a new dodd preamp.
oh, one other thing; i was running electrocompaniet s/s amps at the time; i now run tubed amplification. i would seriously wanna re-audition the linn kairn preamp w/tubed amplification. w/exception of soundstage depth, it is a world-class pre, imo, & its ergonomics are top-notch.
ymmv,
doug s.