Preamp 6922 tube help

loungeaudio +1     Dirty power is most commonly the cause of edgy HF - especially with a SS DAC.   The OP describes his system but no mention of power cleaning.    Is there any?

A second or third vote in support of the Matsushita/National 7DJ8 tubes, I dropped 6 into my preamp about a year ago and they sound excellent. I would characterize the sound as more neutral than warm, with excellent detail. Not sure they are what the OP is looking for but an excellent tube and superb value.

I haven’t rolled 6dj8 equivalents in a long while, but I preferred to Tele to the Siemens, even though the Siemens was probably the more linear tube, the Tele sounded more 3d in the mids. I suspect it was the character of the circuit. I think the "right" tube for you is perhaps even trickier since you are compensating for the aggressiveness of the DAC.
Brendan at TubeWorld, already mentioned, has a pretty good handle on the sound character of NOS tubes and as I recall, he does allow a return.
I’ve used him for years and he’s proven to be a reliable supplier.
I struck gold recently with the Tubemonger- he had some NIB Genelex (GEC) EF86 tubes that were flying lead types that he converted to "normal" tube pin bases. These complement the GEC KT 66 power tubes that I got from Brendan (not easy to find either) for a pair of vintage Quad II amps. I’d reach out to both shops and get some advice.
I roll very little in my main system these days-- the odd rectifier for the phono stage, and one small tube--a 12ax7- in my power amps. I’d say any advice regarding a particular tube will be in a vacuum (sorry) given the balance you are trying to strike.
Out of curiosity, do you have another source that doesn’t use the DAC- and did you reach similar conclusions regarding the tubes you’ve tried so far?

So for power I found power supply with some type of toroidal transformer to be cost effective enough, the preamp has a lps, and the people who design my dac went really far and wrote a white paper a few pages and talked about the effort they put to clean the power. 

The issue pretty much goes away with a switch of tubes. I'll try to change sources and see but I'm pretty sure it's the tubes. 

I got some tube recommendation and ill give it a try. 

All things aside, my favorite tube in the 'J8 family is the GE 6dj8 smoked glass. Rich midrange, yet not bloated. I will do tweaks around them to bring out the top end they lack. That's how good I think they are. 

Now don't ask me about the time I was at a surplus place and pulled out a drawer of about 20 Matsushita CV2493 and only bought 2 at the paltry sum of 1 dollar each!   

Good luck on your search.