Why that looks suspiciously like my go-to RS1e with Beautiful Audio hybrid pads. I really like this combination. One of my first ventures beyond Sennheiser HD650s, it just expanded in every way. As much an aural education as the 650s were. I pack them when traveling, easy to drive, easy on the ears.
And the Grado-haters will not hear any shouty treble. But yes, great air. Great soundstage.
I’m envious (in a good way) thinking what it’ll sound like with those tubes back there.