will
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In my experience, if sound stage is decent in a setup, it can increase with more clarity and spaciousness, also contributing to solving masking as much as possible. As you have probably explored, this can be adjusted with many ways in the room, but simple speaker placement can do a lot. To find the placement for the least offensive tonal buildup and frequency attenuation patterns can be pretty amazing, and where the best placement is can change with tube changes.
Ultimately, by reducing signal push, like with the OB3 replacing an OA3, offensive frequency imbalances become less focused and powerful. And speaker placement/room treatments, help to solve overlapping and frequency canceling sound waves...room-wide, and at the listening seat. Together with tube adjustments, definition and space can be improved, in part due to better definition, to solving masking, and part due to less conflicting reflection patterns that confuse the ear/mind. Less power in the signal from tubes reduces masking/density/thickness and increases definition, and speaker placement can help in the same areas...so they can go hand in hand.
More revealing sound from tubes makes speaker placement more audible, so changing tubes might allow new speaker placement information. And spaciousness and definition with room/speaker changes, and with tubes (also power, cables, vibration solutions, etc) can really improve the soundstage. The right distance from the wall to solve too much bass in the balance and associated, muddled low mids, can be easier to find (and change) with more open clarity from tubes. Speaker width, and subtle (or not-so subtle) toe changes can be refined being better heard.
It sounds like the OB3/JJ E88CC combo is less boomy, but perhaps similarly forward as when you had OA3s and 6N23P (pretty likely the Russian tubes you had)???
The OB3 worked across the spectrum, reducing "forwardness" bass included...it reduces the push and power a bit. So if the sound with this combo is similarly pushy as with the original tubes, but less boomy, the JJ inputs may be powering up at least the mids compared to the 6N23P, countering part of the OB3 change???
Reducing the push with regulators naturally tones down and cleans up the whole signal a bit. Bass build up being a challenge in most rooms, and excess bass causing thickness from the lowest bass to the mids, over-saturated, too big bass, sounds less dynamic, more muddy/boomy. By calming down the whole of the signal density and push, bass over saturation and masking is generally reduced, and the system/room can become more dynamic with better bass definition, sounding like "better" bass. By reducing the bass, it can sound bigger.
Since solving low end masking can be a big problem for soundstage, and the Torii can be powerful at it given challenging situations, I can't emphasize it enough. Since you had boom, you likely had low end masking leaking into the mids and blurring definition and space. Question becomes, what happens if you go further with opening the sound.
A good test tube-wise, would be to stick in your new OD3s for a while. They will take the signal density a few notches less pushy, and more open/spacious than the OB3. I would recommend this to help identify the parameters of your overall sound in your room, and your sound stage. If the OD3 sounds "right" to you with your present tubes, or too lean, this would tell a lot in terms of further recommendations.
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