For some time now, solid state. I have had tube components in the past and certainly understand and appreciate the positive qualities that they can add to a system (their magic was always in the mids in my systems). Auto biasing tubes would be the way to go for me and there there is no "hassle". Never tried a tubed DAC, so I can't comment there. I think this thread will have the majority of voters in the tube category. I get it and understand why. May eventually switch back myself, not anytime soon though.