Best 6922 tubes for BAT VK300x ???

BTW: Should you choose to go with tubes other than the CCa's, which were factory screened/selected for low noise already: Be certain that whatever you get is certified pre-amp grade. Any tube noise will be magnified exponentially if used in your BAT's front-end. I had an ARC SP-14 for a while and used a pair of Siemens E188CC's in the line section with excellent results.

It's all in what you want to wind up with, sonically speaking. Not knowing the end product you wish to accquire, some research is in order... try this spot for some insights... http://www.audioasylum.com/audio/faq/joes-tubes.html

That's where I began and the author is very close on many of his opinions of the different tubes... albeit, of those I've tried, that is.

AH- Something else I forgot to mention about the CCa's: They are a 10,000hr tube(as are the E188CC's), which makes them a bargain with regards to longevity and musicality. You'll note the writers that say the CCa is "too thin" never mention the vintage of the tubes tested. My guess is they were the later(inferior) tubes. There's a bit more support for the excellent Siemens E188CC on this site: (https://www.tubeworld.com/7308.htm) As well as more to read about the other members of the family.

Rodman99999, Great information. I can clearly see the grey on the CCa. Actually, the current price on that auction isn't too bad at this point. Germany ... is the item location. I had an individual here tell me that he heard no difference in the grey verses the shiney CCa's. Of coarse he has them for sale. I'd like to get a pair of these since your experience speaks for it's self. I appreciate the information ........

Not a problem Mr Z. When I got my last ones, four came from W. Germany and two from Argentina. They've functioned perfectly for me. The seller of the pair I showed you posted complete specs, and good pics which are confidence builders in my book(of course- I'm not the one buying them). Let us know your reactions to the differences they make. Happy listening!