Kora Hermes- What valves do owners recommend?

My Hermes came with Phillips tubes installed. I've only had the DAC two months, but during that time I've collected Siemens CCas, Siemens E88CCs, Tungsrams and Mullards. I just swapped the CCas in this past weekend and am letting them burn in, but I get the feeling I'll be like Sjberg and favor the warmer Mullards. Maxie, it's a great DAC isn't it?

Sovteks are aceptable (IMO), if you run all tubes (Pre-amp and amps). Otherwise, I agree with previous posts (Amperex, Mullards, Telefunken, Siemens.

Thanks to all of you for your opinions / advice. I am very grateful to others with first hand experience taking the time to help me out. As is always the case, one must use ones own ears in making a decision regarding equipment, but it pays to listen to any advice offered.