It can be argued it has less of a classic tube sound you would expect from something like an OTL but it won’t sound like a dry neutral solid-state amplifier. I have not heard the Burson unit but I know their classic opamps can sound quite smooth. I think if you consider it like that you are on the right track.

Really nice review. Forgive my ignorance but to me ha2se+ sounds more like solid state? Can you please tell if it had advantages over solid state. I understand it is very subjective and require lot of variables. Just want to know generally please.
Plannining to get one. Wanted to upgrade the burson soloist 3xp

Sorry I dont have the HE1K Stealth Edition to test it with to give you any hands on experience.

For the closed Atrium or open Atrium? Depends on what you want, deeper bass on the Feliks, faster punchier bass on the HA-2SE+.

Sorry for typo l! Wanted to confirm if you like the Atrium more on the feliks then on the Auris?

Also would like to know your favorite amp pairing for the Atrium?

Not sure what you mean with the first sentence but its more 6 of one, half a dozen of the other in terms of preferences. It will come down to what you pairing will be and if you like the sound signature.

No noise on the Feliks :)