Best 6922 tubes for BAT VK300x ???

I should have mentioned: If you do consider the CCa- Make certain to buy NOS from the 60's, with the dull grey plate beneath the getter support. If it has a shiny plate, or date code plate inside, it's from the later production and will singe your ear hairs with it's stridency. Happy listening!

Thank you Dsremer and Rodman99999 for your input. I'll start researching NOS tubes immediately ........

I have had a couple BAT preamps and I like the Amperex 7308's. I recommend the white labels. They exhibit good upper extension and realistic bass. I would be suprised if you can find a pair of CCa's for $200.00.

That estimation of price for a pair of CCa's would be correct. I've got six in my BAT VK-D5, and they were worth every penny. When a tube can affect the equivalent of a major equipment upgrade (vis-a-vis musicality): I'd have to say it's worth seeking out! Here's the vintage to look for: (CCahttp://cgi.ebay.com/CCa-Siemens-Halske-grey-plates-tubes-Match-Pair_W0QQitemZ260240926811QQihZ016QQcategoryZ64629QQssPageNameZWDVWQQrdZ1QQcmdZViewItem) You can see the grey plate below the getter support in the pics. Some try to push later tubes off as the good ones, by not showing the correct angle on that plate. Here's a comparison that Aria posted on the 6DJ8 family, and it's variants: (http://ariaaudio.com/WV_Tubes.html)

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.