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
disagree with post about tube break in.....IMO there's nothing to break in....tubes only start deteriorating the moment you use them until they eventually fail. For NOS 6DJ8 I liked orange label Holland Amperex.....full bodied sound with good detail. Cheaper alternative is cryo EH 6922, but thats not a 6DJ8 but is replacement like the 7308.
Firstly- Extirpate the Sovteks post haste. They are bad from the start and you are correct never improve. Despite Joe's Lore, my British tube Guru told me to try the CV 2493, because it is the only tube in the family that doesn't sound blike any other it is better. Not even it's more common little brother the CV2492 sounds as good. If you nlike Siemens then chan chances are good that you will like these. They are Military Mullards but don't sound like a Mullard at all.
Upscale has them in stock which is a bit odd. They had not been seen for a long while. The picture shown is unlike any I had seen before. I found them eventually from "Tango Tubes" of Sweden. As probably NOS but they did a great job imitating an NOS tube NIB, properly faded original packing cigar roll paper etc. matched and a royally expensive of course.
I have no idea if they still have these relabelled cheap Sino tubes made to look exactly like the real ones snd even managed to sound just the same as the real ones as wewll. As I said they don't sound like any other 6922 in fact they were given a special ID code E88CC-01.
Happy hunting.
Thanks all for the replies. I can tell my fascination with tube sound is gonna cost me some money before I'm done, but it's a lot cheaper that rolling different units in my system. Think my first ones to try will be the Telefunken's and the Amperex.
Colomor Electronics (UK) has an Ebay Store and still lists "grey pin E188CC 7308" tubes at $40/pair. Claim they were surplus military stock for Polaris subs. I bought a few pairs a while back and, while the acid etched code indicates 6DJ8 and not 7308 (and 7308s s/b gold pinned), they are Amperex Holland manufacture. Given the insane prices asked for vintage 6DJ8 family tubes, these may be a bargain. I've not used mine as I've moved on from gear with such tubes, but may sell them of in ten years to help fund retirement.
I use Orange label Amperex and Amperex Bugle Boys. Agree with Larryken - they are excellent.