Is tube sound vs solid state easier to distinguish using headphones?

This is not even wrong... All usual living room share more common defects together than any other things ... The only exception are rare room made of some ideal acoustic component materials for ceilings floor and walls with the optimal dimensions and optimal geometry for a speakers type...

You forgot to compare from ordinary living room then to dedicated acoustic room at some level of optimization ( mine used 100 Helmoltz tuned resonators among others devices ) ...

There is not a shred of similarity between any living room even the best one and a dedicated room designed for a specific speakers-system-ears-brain... None... I know it firsthand... Because i designed my room ...

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What has been very overplayed are the supposed very important difference between two relatively good pieces of gear when people bored by their "sound" decided to upgrade toward a costlier piece of gear because anyway they dont have the dedicated room to improve acoustic or they dont have the time to do acoustics experiments or they dont have the knowledge to do it really , and if you are not creative anyway, a dedicated acoustics room cost more than a high end system most of the times... These are the reasons why acoustics is downplayed by some audiophiles...

You cannot downplay the importance of acoustics... And acoustics included not only room acoustic but many other fields as psychoacoustics and material physical  acoustic, speakers acoustic etc ...

I modified my small speakers porthole and waveguide according to acoustics basic... My speakers which i hated are now top high end in their design and price category...

This is even true for headphones internal chamber of the shell and his content and geometry...

I think the effect of room acoustics has been a bit overplayed online in the last 15 years.

I’ve never done direct comparisons between tubed & solid state headphone amps but have many times over 40+ years w/ speakers albeit it never involved the recent super high solid state amps of $30 K + or so. We all know the negative aspects of tubed amps which are enough to turn off many folks ( heat, tube replacement costs, potential lack of full frequency extension at both ends in lesser designs etc.). The full bodied, rich, 3 dimensional sound w/ air & space around every instrument or singer in a good recording is very challenging for most solid state amps to achieve & im not sure if those qualities would be as apparent using headphones. 

The full bodied, rich, 3 dimensional sound w/ air & space around every instrument or singer in a good recording is very challenging for most solid state amps to achieve & im not sure if those qualities would be as apparent using headphones.

@jonwolfpell  Agreed - and the wonderful spatial qualities of a great 2ch system are definitely not there in even the very best headphone setups.

Back on the topic of acoustics - because the end product of "what we hear and enjoy" goes through so much processing and interpretation in our brains, I think it’s possible there are significant personal differences in "how much" someone hears the room versus the primary sound source, proportionally.

Back on the topic of acoustics - because the end product of "what we hear and enjoy" goes through so much processing and interpretation in our brains,

This is called psychoacoustics...

We can even adress some psychoacoustics factors in a room in a way or in another... I did it...

These psychoacoustics factors matter as much if not more than any dac or amplifier or speakers design...

For example: All stereo systems are plagued by crosstalk effect... An upgrade of a piece of gear will not correct that... Most people had no idea of the acoustic information losses in all stereo system anyway...

The different way any piece of gear process the acoustic information matter less than crosstalk effects most of the times if the gear pieces are minimally relatively good to begin with because the crosstalk information loss is huge... The only exception to this will be comparing the information loss from a bad low cost system compared with one good high end one in the same living room ...

I think it’s possible there are significant personal differences in "how much" someone hears the room versus the primary sound source, proportionally.

This make no sense to me because the source is not a turntable or a digital files, these are mere processing tools, it is the recording acoustics information content resulting from choices of the engineer using his mics craftmanship to record in a specific room; my systems/room must translate this for my ears and give me back this "source" of acoustic timbre, spatial information in an immersive faithfull way.

Second i dont hear my room , i hear because my room is acoustically optimized, i hear the acoustic information of the original recording... For example i hear the Organ recorded in a church as if i was in the church not in my room..i dont hear my speakers as if the sound was coming from them at all, they disapear completely and the same must be true for headphones,but it is very rare for headophone to be the case... Perhaps the RAAL will do it better though compared to my Akg K340 modified as they did it already in a realistic acceptable speaker like way...No other headphones i used do it at all ...

You speak as if the gear pieces choices were the main factor. Marketing want to convince us that it is such. It is false even if for sure all pieces of gear are different and their synergy matter... But gear choices is the starting point of audiophiles, as it was for me; but in truth the room and all acoustics factors (ears-head measures included ) is the beginning and the end and what really matter the most...

I think it’s possible there are significant personal differences in "how much" someone hears the room versus the primary sound source, proportionally.

I reaaallllly don't want to get that much into acoustics discussions lol. I stand by my prior stated experience and opinion: gear choices are more important. And good speakers are more revealing of upstream changes than headphones.