They all sound different. I would stick with triodes: 300B, 45, 2A3, 845, etc. at least to start. What you are talking here is purity of sound, not huge amounts of power. Speaker sensitivity is critical. You want the highest number of decibels at 1 watt/ 1 meter. My experience has been that the sound achieved through simple but elegant Single Ended Triode power amps is so lovely, musical, fast, and somehow "right" that there is no going back. I would choose an amp that has a tube rectifier rather than solid state. If you want to listen to music playback that conveys the delicate sense of the real thing, that wonderful feeling of life and emotion in the music, then SET is the only way to go. The lower plate impedance tubes ( 300B, 2A3, etc. ) seem to my ears to garner first place in the "how do they sound" department.
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