PREAMPLIFIER UPGRADE QUESTION

I just realized the newest Rhumba 1.4 is fully balanced and at $5k with a 14-day trial period that’d be where I’d go first. 

Thanks for the additional info — most helpful.  I was gonna recommend the Backert Rhumba Extreme as well, but the current version is $8500 so a bit above the OP’s budget unless buying used.  Personally, of your choices I’d choose the Rogue over the Bryston because you may find it tough going from tubes to solid state, and the RP9 is certainly no slouch.  I had a Bryston BP6 for a while and it was a great pre but would not consider it to have that “tube magic”.  Not to complicate things further (actually that’s exactly what I’m doing here), but in your price range I’d absolutely have both the Spatial Audio Raven and Aric Audio Motherload XL high on my radar and would choose either over the Rogue, but that’s me.  Just my $0.02 FWIW, and best of luck.

Those are three very different sounding preamps so not really sure what you’re after here.  What specific improvements and sound characteristics are you looking for, what’s your budget, and are you looking for new or used?