I have received my Tungsten a couple of days ago, and due to work and life constraints - I FINALLY just had a couple of hours with my new Tungsten DS.
Testing them on 4 of my amps:
* Holo Bliss solid state: had to almost max the volume. Sounds good but not its best.
* McChanson UltimatE (custom tube SET amp by Eric, Australian tube amp designer and builder): with 6J5 as drivers, and Mazda 6p25 output tubes. Volume pushed to 12 o'clock - the highest ever (big surprise). Sounded better than Bliss. Due to HUGE list of tube options - very likely other tube combination could be better, but would take a while to try more options...
* Solar Flare (crazy custom 45/2A3/300B tube amp by Mischa, super talented amp designer and builder from Canada): again, only tested (so far) on the configuration that was last in use, so FAR from ideal config for Tungsten. Using 12AU7 as drivers and 2A3 as output tubes, amp in SET topology - had to almost max the volume. I will not pass judgement until I try with 300B tubes which should have more power!
* Glenn 6EL3N (again, 1 of a kind design - this time by Glenn): this tube amp uses 6 x EL3N tubes (as the name implies). 2 as drivers, and 4 as output. Out of the 4 amps tested - this was by far the best synergy with the Tungsten. Felt effortless, with volume knob between 5 and 6 (out of 11. Really...
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Over the weekend, I plan on trying my Wells Milo (solid state amp), as well as try other tubes on the UltimatE (#2 above) and Solar Flare (#3 above). I expect both to get better with other (more powerful) tubes.