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Good question. It makes sense. One element I don't want the Rogue amp to lose it its fleetness. My lack of technical acumen comes in at this point, for I'm thinking that a solid state preamp might serve that end better than a tube preamp. If I'm wrong, I surely don't have an issue with being told so.
The Rogue RP5 is a wonderful match for the Stereo 100. Another brilliant option (if you can find one) is the Ayre K-5xeMP. It has been discontinued for a bit but both work quite well with that power amp.
I have owned Rogue power amps (still have a hydra) which is more finicky than the Stereo 100 in terms of preamp.
I have the Stereo 100 amp and really like it. I use the Rogue Audio RH-5 which is a headphone amp as well as a high quality linestage. It is a Stereophile class A linestage / headphone amp ($2500 no phono stage, $2900 with phono).
I was planning on going with the Rogue RP-5 preamp ($3500) but it does not have balanced XLR style connections.
The RH-5 does have balanced connections and the sound is much more dynamic with them connecting to the Stereo 100.
I recommend that you do use the balanced connections for the Stereo 100.
Other than the RH-5, the next step up linestage with balanced connections is the RP-7, which costs more than I was planning on spending ($5000) .
The RH-5 / Stereo 100 combo sounds excellent.
One element I don't want the Rogue amp to lose it its fleetness. My lack of technical acumen comes in at this point, for I'm thinking that a solid state preamp might serve that end better than a tube preamp. If I'm wrong, I surely don't have an issue with being told so.@jimkiely OK :) you're being told so.
A good tube preamp is not slow. It might not be as bright as a solid state preamp; the brightness isn't caused by frequency response as it is distortion (higher ordered harmonics which the ear interprets as brightness). No loss of detail either, if anything IME the other way around!
I have the Rogue stereo 100 and the Rogue RP-7 preamp. Very nice and highly recommended. I have noted that the interconnect cables between the two, and even the power cable can make a difference. I did swap the original preamp tubes for telefunken with a significant improvement (for my ears and taste) in instrumental timbre, articulation, etc. but this is something you tune to your particular taste. Mark at Rogue is very helpful in this regard and will suggest tubes to match your musical taste.