Yeah tube can seem like sea of information not gonna lie. If you can tell me what type of stuff you're looking for maybe I can help you out.

Do you need something for your Arya Stealth and HD560S? OTL tube amp has high output impedance so it's generally only recommended if you have 300 Ohm headphones. Hybrid tube amp on the other hand will be better suited.

How much do you plan to spend on tube amps? From easier / more mainstream stuff you can probably start with Schiit Vali 2++, Lyr 3, Lyr+, Drop CTH, Monolith Liquid Platinum, to a bit less mainstream stuff such as Project Ember II, Hagerman Tuba, or Shortest way 51+. Personally I don't know much about the last 2 amps but it's been recommended to me lol.

For me personally I'm using Lyr 3 and Project Solstice, those are not bad but I'd imagine there's better hybrid amps out there. But it's "cheap" enough as a starting point lol.