I have a wonderful Stax pair including tube amp. Bought in mid-90s for flat living, very costly I recall. I haven't listened for at least 10 years, but I should - the sound was about the clearest and cleanest I've ever heard and they beat most speakers.
Vacuum tube amplified headphones...
....is an item that personally I've no real interest in, nor am I in any way linked to or have any potential to make any financial gain upon....nor do I know any of those involved with them....
But, in the interest of those would might find such an item of interest:
When a pair hits your pate, let me know if it's a hit *ow*...or a miss *(f/m voice) "What?..."*
I get notifications on K/S projects, and this is the 1st one I've seen of this nature.
If I see anything of an 'phile nature, I'll post it 'for your consideration'...just because. ;)
Have a great weekend, J