In the other side and talking of that specs " tree " in those old times the Studer R2R mike owns were not designed for home use by audiophiles but to be used by recording studios and Studer was not the only R2R with the quality levels for that kind of job because were deep quality competition with true challenges for every R2R manufacture. So the specs Studer gaves to the recording studios were the best they achieved on those times to competes against other manufacturer machines. That was the overall context on that Studer issue.
Ralph, I appreciated that this time you posted with a good attitude and not trying to hit me and that’s why I give my answer.
Probably those mike’s Studer performs a little better but even that is not a today reference and cant compete in any room/system with what I posted: reference is the digital medium other than live MUSIC.
@rauliruegas I get all that you are saying about tape degradation. But your comment in the last paragraph really isn't correct. If you spent some time recording live with such equipment you would know why- they can be so beguiling that you can be easily fooled into thinking that what you are hearing on the headphones is real as opposed to a recording. Yes, they are that good.
A direct lathe cut is even better as it is lower noise and wider bandwidth.
But for the most part, regular audiophiles in the trenches never get to hear what such equipment is really all about and how real the recordings they make actually sound. In the studio, if the engineer is careful, the big difference between digital, tape and the mastering lathe is cost, not sound. Again if you doubt this, I advise spending some time around such equipment to get to know the ropes. FWIW I've managed recording studios since the mid 1970s.