As alluded to in previous posts, just as with traditional systems so much of this comes down to personal tastes/preferences and system synergy. I’ll just throw out there that with classical music I prefer an open-backed headphone as it provides more of that “out-of-the-head” imaging that I find works well especially with larger-scale classical recordings. Whether you’d prefer a dynamic driver, planar, etc, only you can decide as they each have their strengths, but if you want to use a tube HP amp I’d shy away from planar models.
All that said, one combo that might be worth a look would be the Hifiman Arya planar ‘phones you can get open box from Hifiman for $1299 and the Singxer SA-1 Class-A amp for $599 that, while not tubes, could provide some similar qualities. The Quicksilver headphone amp is a tube amp that might have the juice for the Aryas but would be a little more pricey. Just some other options to consider FWIW, and best of luck.
All that said, one combo that might be worth a look would be the Hifiman Arya planar ‘phones you can get open box from Hifiman for $1299 and the Singxer SA-1 Class-A amp for $599 that, while not tubes, could provide some similar qualities. The Quicksilver headphone amp is a tube amp that might have the juice for the Aryas but would be a little more pricey. Just some other options to consider FWIW, and best of luck.