PX-25 tube amp with Merlin VSM speakers?

Interestingly, upon a closer review of the specs for my Primaluna Dialogue Premium amp, I'm currently running the Merlins on 12WPC as I use it exclusively in triode mode (which sounds significantly better to my ears than ultralinear), with NOS Siemens RFT EL34 tubes. That gets plenty loud in my small room, has solid bass energy and drive (although I'm not "all about the bass"--more of a treble and mid-range guy, but musical, tight bass is still important). Frankly, my setup sounds good enough right now that a significant part of me wants to just leave things as-is for a while.

But now that I have a dedicated, relatively small room, I have been wanting to test out the magic of the SET sound that many people talk about, just to see if things could be further improved. If I had to point to a flaw in the sound right now, it would be that my system is a little bit too brutally revealing of any flaw in a recording, and accentuates distortion that is sometimes present(for example the notorious distortion at about 5:30 into Stairway to Heaven is quite prominent to the point of distraction, both on the vinyl and the digital files), and overall the sound is ever so slightly forward in the treble range, which is noticeable on some recordings where the treble is a little on the shrill side to begin with.

Atmasphere, I have wanted to try one of your amps in my system for a while as well (and loved what I heard from them at RMAF this year), but people tend to describe the OTL sound as very detailed, revealing and neutral, which is what I have now in spades, in contrast to the typical SET sound which is a little warmer in the middle and slightly softer on top. From those descriptions, trying out an SET amp would in theory be a better fit for what I'm looking for.

In a perfect world, I would demo a bunch of amps in my system of course. The Art Audio Diavolo on that other site is tempting, and claims to have special order upgraded transformers from Art Audio, but the reviews of that amp fairly consistently say it's a little forward in the treble department, which is probably not what I need. In going with just the description of reviewers, the Carissa seems to be a better fit for what I'm looking for. And the 6WPC PX-25 seems to be a higher risk proposition, although now that I know I'm currently only using 12WPC, it's still a little tempting.

Oh, the dilemmas presented by this hobby and all the options. And I know, I know...first world problems...

Dazzlingmd,
I just rechecked and Bobby recommends 17 tube watts minimum for the VSM's. What about a parallel SET that is still single ended but pumps out more watts? They are said to give up little of the SET magic but may give you the power you need. Or how about Decware's Zen Torii? Not a SET but (according to Decware) possessing most SET virtues, sonically.
Or, talk to Bobby. He lives to give advice on stuff like this. :-)

Thanks, Rebbi, for adding to the dilemma with the suggestion of another amp that sounds pretty amazing from the reviews and people's experiences! :). My gut is that I would be unlikely to change to another EL34-based push-pull amp as that's what I have now (and am very happy with how that sounds), and that I'd be more likely to try something different, but wow, the buzz on that Decware amp is through the roof.

Dazzlingmd, the difference in a P-P triode amp making 15 watts and an SET making 15 watts is that if you want to hear what the SET does, its likely you should not push is past 3 or 4 watts. Otherwise the higher orders come into play.

(The higher-ordered harmonics behave as loudness cues to the human ear/brain system, causing the SET to sound more 'dynamic' than it should be for such low power. This is something you will often see in reading reviews of SETs- its a psycho-acoustic interaction; once you realize that is has to do with how the amplifier makes distortion, its also easier to hear the amp doing it, so in a way I may have ruined it for you by writing this...).

With a push-pull amp this is less likely. So you get a greater percentage of usable power.

With our amps, as they have little or no feedback but are a form of push-pull, they too have a greater percentage of usable power, but are also quite relaxed in the mids and highs, in fact more so than the typical SET because they are lower distortion. Yet they also have more detail, owing to the lack of an output transformer. The combination of our M-60 on the Merlin is quite good, which is why the Merlin is one of the most popular speakers used with the M-60s. What is nice is to have 'highly detailed' in the same place at the same time with 'relaxed presentation'.

I ended up rolling the dice by pulling the trigger on the Diavolo. At that price it was worth a shot and if it isn't an improvement I can sell it for what I paid and reassess. The Diavolo is supposed to have enough power to easily drive any 90db speaker or higher with authority, and mine are 89db in a small room with a flat impedance curve so I'm hopeful that it will be enough power.

It should be here by the end of next week and then an amp shootout will be in order!

Also, if anyone has thoughts on the difference between the 32b tubes that come with the Diavolo versus the 300BXLS that it can also apparently take, I would be interested in the sonic differences.

Thanks to everyone so far for all the helpful information and ideas.