It is interesting to hear that triode amps typically gives deeper soundstage. Would like to hear more about your experience with them. And are you talking about those priced in the stratosphere, or does your comment also include more mortal amps (thousands and below)?
Have not tried them, curious to wade into the waters, but they can burn a substantial hole in the wallet, so studying up for now.
*if there's some policy against grave(thread)diggers, my apologies in advance...
Most of my experience is not recent. I used tube amps for 15 years or so. Most of my triode amps were Ultralinear designs I changed to triode.
The experience making things clear is a series amplifier experiment I did. I had some VTL 75/75's in triode with Quad ESL63's. Also had a Spectral DMA50. I liked both, as both could make music. The triode painted a bigger, 3D, deeper more dynamic space than the DMA50. I thought the triodes managed getting more off the recordings than the Spectral. In an effort to see how much the Spectral filtered out I thought I would run them in series. Loaded the amp with some power resistors, had a voltage divider to achieve unity gain. I could connect my DAC directly to an amp or have a 2nd amp in between. Get an idea I thought on which was accurate.
My first run was VTL triode feeding Spectral which powered my Quad ESL 63 speakers. I expected to hear the sound of the Spectral. To my surprise I heard the sound of the VTL. Spacious 3D, wide, deep, dynamic soundstage. I was surprised. Remove the VTL and feed Spectral direct and all of that went away. I then reversed the amps with the VTL Triode powering the speakers. You could tell no difference if the Spectral was in circuit or out. It was the old straight-wire with gain result. The only conclusion that fits is triode sound is a group of usually pleasing colorations.
For a time I used a 2 watt SET for a preamp. It worked giving my Quads the sound of being driven by an 80 watt SET. Now in my experience with SET's most are too colored. They go a little too far. I prefer the sound of push-pull triodes. Knowing they aren't accurate, but often very enjoyable.
PS-I also would say having done a little bit of amateur recording, I find the pure accuracy better than triode enhancement. But you don't know how the original recordings were just playing back commercial recordings.