will
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I should clarify that a bit....
Some folks seem really good staying with the stock tubes more or less in their Decware amps, and maybe playing with new brands or NOS when replacements are needed.
And I have no doubt that using just an SE84UFO with tubes available can have many flavors playing with three tube types.
A little more out on the tubehead, tune-ability loving limb... in my current setup, I am using my 300B amp which has four tube types. A 6SN7 input, though at the moment I am preferring a little more open and powerful sounding 7N7s with an adapter, making the amp clearer and more vivid. Its internal set up is still just a little dark/full for me, but as much, the 300Bs I am using now are a bit warmish for me. So using cleaner, more open tubes in other places to pull the deeper beauty is a great tool. And beautiful it is! Open these 300Bs up with other tubes, and the amp really sings, even without a lot of hours on the 300Bs...
For drivers are 6BX7, and I hear less profound differences in makes and vintages, but still useful for sound shaping. Then 300Bs and rectifiers, variations of both pretty powerfully influencing this amp's sound. Seems these 300Bs in a resolving setup, and in this amp, can be changed by the other tubes in big ways, particularly powerful with the input and rectifiers. Both of them together can make a particular 300B sound really good, great, or pretty world class lucid music with the right tube support.
Also, I am using a ZBIT, Zrock2, and ZStage as pre. The latter two I sometimes use 12AU7 variants, and sometimes 12AT7 variants, which can represent pretty vast choices for adjusting sound with these one-tube components... and even more so tuning them together, and with the 300B amp.
So this system has four components after the DAC using 6 tube types, as well as the ZBIT, ZRock, Zstage gain adjustments for pretty powerful tuning tools, all of which I play with regularly, especially as I get to know this amp.
In my Torii IV system, the Torii has 5 tube types, all very useful. Though I don't adjust VRs much anymore, I am really glad to have been able to adjust them to tastes, as I much prefer how the ones I use influence the rest of the tubes and sound options in general compared to stock. Then the ZBIT, then ZRock, then CSP3 which has 3 tube types, all of which I play with fairly regularly for overall system tuning... for optimizing other tube changes... and for changing up the sound experience some, helping me hear more into the music.... So that is 10 tube positions, 8 that I enjoy playing with with some frequency, along with four gains to tune optimally for system/room, and for recording variations.
Of course, this is how my journey has evolved, and not for everyone, but great for crafting a very refined sound to tastes and room. Pretty amazing how this many options and more can take it all above and beyond in optimization toward a deeply transporting and authentic sound.
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