I love my Campfire Andromeda CK Pacific Blue from Jan 2017 and still listen to them even today

A planar magnetic headphone that has a linear impedance curve will sound almost the same with SET amp and a Class A Solid State amp. I have the Susvara and I use my SET amp drive them and got a chance recently to plug them in to Schiit Mjolnir 3. Honestly I’d be had pressed to them them apart on a blind test since they sound 99% identical to me with the extra 1% for the SET amp a tiny bit brighter than Mjolnir 3 with Susvara

Tube amps will definitely have a noticeable difference than solid state amps due to much higher output impedance and the very high 2nd order harmonic resonance (depending on tubes and tube circuit)

You can get a much better performing amp than that for a lot less