I prefer the Tesla tubes over Sovtek.
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I am thoroughly enjoying some Mullard CV2493 gold pin tubes in both my Hermes and Eclipse. Wonderful body, air holographic imaging and smoothness while still offering gobs of bass, nuance, detail and high and extension. They really add to the Kora gears ability to bring the essence of the music alive. To be fair though I've only compared them to the Sovteks.
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?