Best 6DJ8 tubes?


I have a Carver C-19 pre and SDA/490t cd, both use 6DJ8 tubes. Both units were recently serviced and had Sovtek tubes installed. The tubes in the cd player only have about 10 hrs on them, but the sound isn't nearly as warm as it was before replacing the stock tubes. I was wondering if anyone could recommend the best brand I could use, if 6922's would improve the sound, and the standard burn in time for the new tubes.
skipf

I 2nd Amperex Philips E88CC SQ special quality. It ended my tube rolling and all I use in my Sonic Frontier components.
I have Amperex 6DJ8, circa August, 1962 and they are magnificent...using them in an LSA Statement Integrated Amp, the preamp section. WOW, what a tube this is...better than Telefunken and many others. Pricing is not for the faint hearted though.
Does anyone, HAS anyone cryo'd these??

Larry
Yes,
And, variable...of course too many factors to be certain as to why.
Again, cryo'd ?
Larry
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