Preamp 6922 tube help

To my ears the Matsushita tubes suggested above are no better than new production JJs.

Might take a look at Mazda 6922 (Brent Jesse carries them)

Totally disagree about the Matsushita/National 7DJ8 tubes. I have both the new & old JJ's and the National's sound much better to me. They even replaced my reference Valvo Cca's. 

Here is a little about my gear.

I have a Mirus DAC, I would characterize the dac as being very aggressive with details, if it wasn’t for a preamp tube stage, it would be too much for me.

For preamp I use a Pathos aririum, I would say this preamp tries to enhance the sweet spot for all tubes, all tubes sound great on it, unlike some preamps, that sound terrible when you put in some not so great tubes.

That is pretty much the combination that I like, in terms of balance of sound that I like. The tubes really soften up the dac.

The rest of the chain is a solid state amp from audio source and run a set of ADS L620, the speakers were also recap using Jetezen Superior, which retained the qualities of the speakers. I also run a pair of subs.

The speakers are two way, acoustic suspension design. I find two ways even though it lacks detail, compared to systems with more drivers, creates the best imaging. I also like the sound of paper woofers, for the tonal qualities they produce. They are also one of the more non fatiguing speakers, because I listen to music about 4 - 6 hours daily, sometimes 8. I also listen to music about 60-70 db most of the time, and when I am feeling it push it to 80-90db.

So that is how my gear is assemble to produce the most natural sound.

The CCA are really great tubes, and I think I will still keep them, but I just can’t turn them up all the way up. They work well at low levels and I can listen to them about 2-3 hours a time, before fatigue sets in.

Prior to the CCA my favorite tube was the telefunkens, they were razor flat in presentation too, but eventually I didn't like the rounded out bass, it didn't sound natural to me. The CCa now have issues on the other direction, I love what it does to instruments that reach highs, really give strings that sizzle, but my ear's can't handle them for extended periods. They do sound magnficent for the 1-2 hours i listen to them for. 

Nice digital system! The CCa tubes are really revealing units. Basically you have upgraded up to the point that you are hearing the true nature of the sonics of your DAC, the AC power that is feeding it, and the files/discs it plays.

EMI and RFI are enemies of the character of a DAC's highs. Every time I have used an EMI/RFI line power filter on a DAC the digital glare calmed down. I highly recommend you try one on your DAC.

Here is what I am talking about, 

http://www.newark.com/te-connectivity-corcom/10et1/rfi-power-line-filter-10a-500ua/dp/52K4501  

There are much smaller filters available but the one I link is vastly overrated so it will pass current freely to your DAC. 

The problem is that it has to be wired into you power line feed to the DAC. I have always spliced them into an IEC power cord or a normal power strip. 

There are plug and go solutions like Furman but the filters in those are not nearly as strong as the Corcom I linked.

Every time I have used these I have never regretted it.