It has output transformers. Nighthawk is pretty easy to drive. Should be easy with any tube amp.
You'll want an amp with relatively low output impedance so OTLs aren't a good idea, but a tube amp with output transformer and most solid state amps will sound great with NightHawks. There are a few solid state amps around with unusually high output importance (like the original phonitor), but it's unusual.
right on thanks guys - im still new to this stuff and still learning... so i used to think all high end cans were high impedance, so now is low impedance the future?
i dont have a ton of money to spend though, so will the littledot i+ with some mullard 6hm5s drive these nicely with a nice vintage warm honey sound?