I think the signature is made by all the parts...design/layout, enclosure materials, transformers, wires, caps, resistors, feet....the foundation. Then there are tubes! Also big players. Each tube has its own signature, and when you play with combinations, particularly with all the tubes types in the Torii MKIII and Mini Torii (look at all the power tube options alone with the MT), you can seriously effect the sound. But whatever the variation of signature the tubes bring to the sound, the sound will be in the context of the foundation signature....So, relative to perspective of what signature is, and tube choices a given amp has....I would say mostly yes.

As far as fine tuning to a room or personal tastes, you definitely can do this with tubes, but within limits of the gear and environment. For example, if your amp is bassy, you can tune this out with tubes in various ways to a pretty notable extent, but depending on the room issues, it could be too much for tubes to fix, and be better to solve the room first. That said, you can change the outward and inward character of every aspect of the sound with tube combination play.

For personal taste...with my Torii MKIII, the many tube types, tube companies, vintages, etc, you can play and play and play with great success. I love it. But my system/room is pretty sorted out and I have a really good set of adjustment tools (a good range of each tube type, treble/bass knobs, different sounding cables and feet, and low EQ in my player software that I can fine-tune if necessary.....) so I have considerable flexibility that allows most decent tubes to sound great with the right tube combination.

I think this would be more limited with fixed treble/bass/EQ, and with less tube types, but I think tubes can be big players in the signature.

Since my room acoustics, my system, and my (silver) interconnects are so neutral, the driver tube socket of my Zen Triode is basically my tone control... I even have a gold pin socket saver in there so the stock tube socket won't wear out!...

I'd love to make a 'tone control' with a dozen or so driver tubes, all selectable with a switch!... Could even make it look like an old-time radial airplane engine!...   (m.)

Thanks, guys.  I see nice opportunities opening, then.  

Up until a few days ago, I'd been underestimating the true tube-rolling leverage potential.  I mean, I thought mostly depended on the amp's original design and components' selection.  Sure, I thought, some minor tweaking may be obtained by swapping tubes (if the user knows which to choose), but I believed in general one was pretty much stuck within the design's framework.

Now, I didn't mind, as the Mini Torii is just wonderful in stock form.  But then I started reading here and there, and getting meaningful feedback from you guys (thanks Les, Will, Lon, Lord Soth, RR, Radu, Eric and countless others in this forum), that I started reconsidering.

Mark, I understand your point.  Many people believe that's the single most important tube to affect sound, especially when sinergistically coupled with the right rectifier... You may want to consider a second radial engine in tandem, carrying rectifier sockets  

While waiting for my tubes to arrive, I've been thinking on the procedure to follow (an earlier discussion thread), and foremost the potential leverage involved.  So it ocurred to me you guys must have gone through this already, and thought I would ask.

I know and expect tube-rolling to be just a portion of the total sound tweaking potential (as Will and Lon have indicated), but was also hoping for it to be powerful enough to circumvent my personal limitations in terms of hands-on skills other people apparently enjoy (to solder, read circuit diagrams and in general change the topology components with certain objectives in mind, including Caps substitution, etc.), and still be able to get my own humble 'signature' in the voicing.

I'm happy these first replies are encouraging enough, and without neglecting other crucial parameters discussed (vibration control, room conditioning, improved sourcing, cabling and power treatment), I think I'll start here and work my way around these other variables in time.  As it's the case with vibration control, in my mind now tube-rolling is technically feasible and probably even affordable for me (need not get carried away), and can bring a big punch!  :)

Will,

I expect in the end to have sorted out (hopefully) a specific tube set recipe for certain types of recordings, and another for the rest, or something to that effect.  

I'll be also testing my own ears, as during the experiment I'll need to be very discriminating and objective to ensure correct conclusions.  

All this should pave the way for the following tweaking adjustments, as I would now rely on a more solid and revealing foundation.

It will sure be fun, thanks!

I see ... Interesting.  Let me see if I get this straight.  You mean ending up with multiple variations you like for different reasons, in an endless trade-off?

I would expect some kind of convergence to it unless the tubes become an infinite source.

That is, I would expect finding a normal distribution, with a few combinations that really stand head and shoulders upon the rest, others really sucking and the rest a middle of the road, probably a majority, which may evidence some tradeoffs you may want to live with, each for specific selections of music or listening conditions (niches).

In the described scenario, I would keep an open mind about which ones go where, but in the end the process always converge for a given (fixed) set of tubes and tastes, isn't it?

Maybe I'm misreading you?

FB, Each tube will have a distinct character that can be sort of obvious...for example, you might describe a tube as "balanced, transparent, open, with deep bass and extended highs".....Or perhaps "warm with a balance accenting the lower midrange, but also having nice detail and extended highs"...the big character values.... But then, with nice tubes, you also hear the very complex values of various levels of inner detail presentation, how textures and definition interact, subtler bass values, elements of micro dynamics, how detail retrieval expresses throughout in layered ways and perhaps a bit more in a particular part of the spectrum, and so on... each tube fleshes out the whole musical spectrum in its own way. This very complex character in turn reflects on, and interacts with, the complex characteristics of the the rest of the tubes in the set.

So, each individual tube type brings its own characteristic qualities, but within that, each tube brings its own complexity based on its construction....materials, design and method of making. In obvious listening 6DJ8s for example, tend to have a family resemblance, but variation between individuals can vary in very interesting ways, and how they arrive at synergy with the rest might come in unforeseen ways. Due to the subtle characteristics of each tube a set can come together in predictable or unpredictable ways...sometimes in truely amazing ways. As you suggest...  "the recipe" can be quite variable.

The bottom line is that even with the small selection of well chosen variety of tubes you will have, you could have lots of combinations that are very pleasing across most of your recordings, and some of these may not make sense based solely on the more obvious characteristics an individual tube brings to the matrix due to this enigmatic nature of individual tubes and how they interact.

And then, one day you might think, hmmm this sounds brilliant, but I wonder what these power tubes will sound like in the set. And this might sound really interesting, but be a bit thick or warm, so you might think... I wonder what my brighter VR or rectifier might do.......finally finding a not calculated, but fabulous "recipe."

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I can't wait to hear about your fun!

I think you could have sets that will be mediocre or even bad to you, but once you recognize the more obvious values of the tubes you have, you can intuitively mix and match to bring out the best of the group by balancing characters, and then fine-tune it to pull the bigtime beauty!

I think it is all individual...but what I am pointing to is the fun of organic exploration and the possibility of having ever evolving really good tube sets that play it all well. I can also imagine having one or more distinct sets, but this would not be my style. I doubt I have ever arrived at exactly the same set in there as I have had before, but I always have a totally amazing and exciting sound that plays well with all I listen to. This is what I meant by endless variations....not of distinct tube sets, but of an ever evolving and changing single set.

I personally can't imagine changing sets for specific recording qualities or music types....I like to play the field of my music without restriction and at will. But this is me...distinct sets could be a totally valid approach.

It will be really cool figuring out what makes you happy!

Have fun!

Will