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RE: Tube preamp sweet spot/amp compatibility?

The preamp has 6922's I bought off EBAY 12 yrs ago, not matched or tested which could be the issue. They are RCA branded, E88CC/6922 labeled. I think the date code was 7004. Just put brand new tubes in the amps except for the 12bh7 (GE). Shuguang KT-88-98 (Ruby), Mullard GZ34, RCA 12AX7A (from VTS).
Speakers are Reference 3A MM de Capo (92db).
I recently pulled this all out of storage and am trying to get it dialed in. At low volumes there's tons of midrange lushness/detail/liquidity and when I turn up the volume to "fill the room" level (not blasting it) the sound kinda dries out a little. It still sounds good, but not nearly as lush as at a really quiet volume level. Just wondering if maybe the gain isn't matching the amps or I'm overloading the tube and it's distorting or something that's causing the sound quality to degrade at the higher volumes.

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