6922 Replacements for BAT VK-300x

I purchased a pre-owned VK-300x integrated, and one of the 6922's is microphonic. I replaced both tubes with a spare set of Sovtek's that I had laying around. I'd like to put something a bit more refined in their place. Has any BAT integrated and/or preamp owner here experimented with anything else that they would recommend? My preference is to lean towards warmth over an analytical sound.

I've tried to call Andy at VTS, but I'm not sure he's still selling tubes based on a couple threads I've seen here. I've purchased from Kevin at Upscale, but his "didn't buy gear here" prices are quite high. Anyone here purchased from Tube Depot with success?

Thanks,
Chris