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Yes, but.... you never mentioned what your source is. Any amp needs a certain level of input to reach full power. For the UFO amps it is 1.5 volts. Most sources these days will output more than 1.5 volts and can easily drive a UFO to full power, but maybe yours doesn't so a preamp is needed to provide the extra gain.

What I think is going on, and what has been my personal experience for many years, it that a tube preamp adds just a little bit of secret sauce to the sound that makes it seem bigger/better/louder even though the amp isn't putting out any more watts. JMO/YMMV and all that, but I can't imagine having a system without a tube preamp.

FWIW I started my career in physics, and I like to say I worked my way all the way down the ladder from scientist to programmer to system and network administrator.

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I guess I might quibble with the idea that adding a preamp will make your system sound like a different amp. But it will make your system sound a bit different in a way that most people like but is difficult to predict precisely. It will certainly give you added flexibility in tuning your system to your liking, both through gain riding and also the selection of tubes for the preamp, in addition to tubes in the UFO2.

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I've been following this thread and I find the quoted comments interesting.  Not disagreeing in any way, after all a lot of what we prefer tends to be subjective.  However, after reading a number of posts, I'm of the opinion that we take for granted a very key component... the room....  

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It is my opinion, FWIW, that until the final component, the room, is addressed we will never hear the actual purity of any upstream component.  I have worked with my UFO25 at some length.  Tube rolling, upgrading cables and upgrading sources.  The realization that I came to was that as I removed handicaps I became aware of just what the UFO25 strong suit was... transparency.  It has no particular sound, so to speak.  It will let you hear whatever it is that you put in front of it.

Having said that, the room will affect what it is producing, so that once again, you never really get to hear the "purity" of the amp.  Not everyone can treat a room.  I'm in the process of putting together my sound room and it will be compromised to some degree as I really don't want a "butt ugly room" (subjective of course).  But I do want a significant degree of improvement through strategic room treatment.

My conclusion based on my experience is that often times I was compensating for the room acoustics when I was tube rolling or changing cables etc...

Did the amp sound different as I made changes?  Of course it did.  Did it sound like another amp?  It never sounded like any other amp that I ever had but then I haven't listened to all the amps that are out there not even all the Decware amps, so I really can't say.

So what's the point that I'm trying to make?  It isn't that we all have different rooms and different preferences, that's obvious.  I guess it would be that we need to keep in mind the whole context of what effects what we hear otherwise we could end up coming to conclusions that in themselves are subjectively correct but objectively misleading.

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I'm not familiar with Leben, but I checked out their webpage. I think it might be a little awkwardly translated from Japanese but the way I read the specs (and a couple of reviews) is the RS100 is capable of output up to 52V not fixed at 52V.  In the specs section on the RS100 page on the MAX OUTPUT line it says "52V variable" and "0-52V fixed." But JMO/FWIW and all that.