will
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boka,
"best performance" in Steve's opinion, and in his very well treated room, and with the speakers he tested the amp with....this would all be true.
But whether you like this in your room and with your gear becomes the question. In the big Toriis, with the OA3s, you can really tune the general push of the amp sound to tastes. I can't imagine that the effects are not similar in the MT. Steve would not have offered this option of rolling compatible tubes if it had been possibly detrimental to the amp. We just have to be sure to use compatible tubes.
With the big VRs, though they vary soundwise within vintage and make, the voltage of each is rated the same, so they will drive the power tubes similarly by type. Within the tonal variation depending on vintage and construction, the OA3 will push the power tubes the hardest, giving you the most sense of push and density. If you would prefer a slightly leaner, less driving sound, the OB3 is a valid adjustment to provide that. And progressively the OC3 and OD3 will open things up more and reduce density.
The OC2 to OB2 has a similar effect, but on the input tubes. In my big torii going to and OB2 sounds cool, but finally to me has too much effect for leaning things up, but it all depends what you want and where you are starting from sound-wise.
There are bound to be threads here that offer opinions of rectifiers, power tubes and inputs in the MT, and how different ones effect the sound, also valid areas for adjusting the sound to taste. It just depends how deep you want to go. The stock tubes always sound really good, but you can go further with rolling if it suits you, and refine to your environment, system and tastes.
The bottom line to me....especially with VRs, they do relatively specific things to the sound and can be very useful if what they do is what you need. If you have too much density overall, or the low to mid-bass is too dense and heavy, or if your sound feels a bit in your face, depending on how much change you want, trying an OB3, OC3, may be worth it. This is how it works in the Big Brother Torii, and presumably like-wise with yours.
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