BEL E88CC/6922 tubes - what can I expect?


Lately I've been tube rolling 6922s in the gain stage of my Sonic Frontiers Line 1 preamp, and considering trying the BEL E88CC/6922 from Upscale Audio.  Since Upscale doesn't provide explicit recommendations on tubes and these aren't available other places, I wanted to see if anyone has opinions on these, or maybe there are other tubes I should try?  So far have tried 
-  Svetlana (came with preamp) and these were dull, lifeless.
- Electro Harmonix gold pin - ok but kinda boring compared to others.  Currently using these in input position.
- Amperex white label - fun but a little too tubey.
- Matsushita - I really like these but also a bit too much tubiness over time.
- Mullard - favorite so far, just sound right.
- GE "smokies" - still evaluating.
FOMO is creeping in as it looks like Upscale's inventory is dwindling.  Any opinions?  Other tubes I should try?

System - Thiel 2.3s, Krell KAV amp, SF L1 pre, bel canto 3.7VB DAC, decent room treatments, always think the higher end could get better if less sibilance/reediness.

Thanks!
thosb
Wow thanks guys, much appreciated!  Telefunken is on my radar and actually would be top of the list except for cost, now I can add Siemens to the hunt.  I had kinda ruled out Gold Lions but maybe I'll reconsider, after all, how do you really know w/o trying?  Also the links are much appreciated, they'll help expand my not-so-vast knowledge of tubes and associated vocabulary. 

My understanding of the Amperex tubes I have is they were made in USA (White Plains NY?) and were destined for military use, as opposed to the Mullards.  But they are not plainly marked to my inexperienced eye.  

And most importantly, I can pass on the BELs and my FOMO is out the window.  

FYI, my reasons for tube rolling are 1) cheaper than equipment rolling 2) improve listening skills 3) easy to make changes when things start to not quite sound right anymore.  Last night I put the Matsushitas back in and was a very happy camper.  We'll see how long they last.

Final question - 
Final question - this might be too SF pre specific, but is it worth to put high quality tubes in all six positions?
     Imagine yourself watching an HD video, through three lenses per eye.

     How many dirty lenses are you willing to tolerate?

     A very subjective question.
@thosb

Final question - this might be too SF pre specific, but is it worth to put high quality tubes in all six positions?


i will say it again... the search bar above is your FRIEND...

https://forum.audiogon.com/discussions/tubes-for-sonic-frontiers-line-1

first post of this gem of a thread from 2005 when the sonic frontier linestages were the cat’s meow

""Chris suggested putting your best tubes in the two back spots, and I ended up with Siemens CCa in those spots and Siemens 6922 nickel pins in the other four spots.""

have fun, and good luck rollin’...
thosb, If you don’t want to take the time to become an expert on tubes, the manufacturer is usually the best source of information and they are usually willing to talk about tube rolling with owners, even if you bought the gear used.

An alternative is to talk to a tube seller who has the approval of most ’goners who have dealt with them. A couple who regularly get high marks are:

Andy Bouwman of Vintage Tube Services

Vintage Tube Services | Tubes you can trust! Providing vintage audio tubes (new old stock) to audiophiles around the world. Celebrating 28 years of technical knowledge, experience, expertise, and tubes you can trust. For a free phone consultation call 616.454.3467.

Brent Jessee

BRENT JESSEE RECORDING HOMEPAGE (audiotubes.com)

Both of these guys will be happy to talk to you. Andy can be hard to get ahold of and can be slow in getting your tubes out from time to time, but he’s very knowledgeable and has great tubes. Many people swear by Andy. Brent is usually quicker and also has great tubes and service.