Yes. I have the CDP7 (I am in Taiwan). Mine came with 2 ECC81's labled "CVC Chelmer Valve". I believe this is a east European tube distributor that bought tubes and brand them. So I guess these are either Chinese or Russian. I have changed them to Siemens ECC81s, ECC801s, and E81CCs, and Mullard ECC801s (that's all I have now). So far the best is the Siemens E81CC+EcCC801. There is a distinct change in sound, from rough (comparatively speaking) to delicious, from dry to quite sweet (especially on the top). However, I do notice a rolled top and overemphasized midbass as noted in the latest TAS. This is the same while using the original tubes. I will be getting several other tubes, including the GEC A2900, Valvo 6201, GE 5 stars 6201, Brimar 6060, to name a few, to see if I can do better. DO ask the importer and let us know. I'll report back.
PS: Do you find equipment isolation as a big change to the sound as mentioned by HP?
Harbeth 40
Hovland HP-100
Symphonic Line Kraft 250
Lector CDP7
Roksan TMS/Triplanar/Shelter 901
All interconnects by Oritek
Speaker cables by Anti-Cable