ISO: Tube headphone amp for Planar headphones

@freediver Thanks for the info on the Cayin. I finally found an image showing the internals and was impressed with how it looks.

https://cf.shopee.co.th/file/40719695d2fd237fd6c597227d88277f

And it is pretty outside as well. 

The other candidate is the Quicksilver HPA suggested by @larsman. What I like about it is it's simplicity and rugged build. And it's JUST a HPA; No extra electronics to drive speakers that I won't use. It's not as pretty as the Cayin but it gets rave reviews and it's built just down the road in Stockton CA. It is however almost $300 more... I've pinged Quicksilver to see if there's a dealer in the Seattle area. 

Decisions decisions...

Happy listening.

I'd recommend the Quicksilver Headphone amp, and it should fit nicely in your budget.... Excellent out of the box and even better with some judicious tube rolling.

https://quicksilveraudio.com/products/headphone-amplifier/

 I've owned both the HA-1A & the CS-55A integrated amplifier..Both were SUPERBLY built & in 5 total years of ownership never a single problem or hiccup..
 Bloom Audio carries the HA-1A & offers LIFETIME support,including assistance with Warranty Support should a problem ever arise...
https://www.google.com/aclk?sa=l&ai=DChcSEwiP6vGJsOaJAxVpMdQBHaLlOx0YABASGgJvYQ&ae=2&co=1&ase=5&gclid=Cj0KCQiA6Ou5BhCrARIsAPoTxrC2L7ap_Z5p_STsrwAJ45J5tOLnZlikyc174vRAzXWhVacvjQe2Hw0aAoZJEALw_wcB&sig=AOD64_1jicn1DEJwizhLKkx4BwBh4desIw&ctype=5&q=&ved=2ahUKEwiHr-eJsOaJAxWR48kDHR2sIyoQ9aACKAB6BAgHEBk&adurl=

@freediver Thank you for the info regarding OTL designs. I was not aware of that being an issue. Because it's the internet I had to look it up myself and lo and behold you are correct. Please don't take it personally.  

My digital front end is Bluesound Node2 into a Border Patrol DAC then into an ARC SP-11 Mk2. To drive the HPA, I have leads coming from the tape out on my SP-11. This allows me to use my headphones for all sources including my California Audio Labs Aria CD. 

The problem I'm seeing with the APPJ PA1502A, Cayin HA-1A and the  Yamamoto HA-2 that @tooblue was recommending is that there are no US dealer/distributors. Not even AMZN and they carry everything. And not that I have anything against "Chi-Fi" but the Cayins I find are 100VAC for Japan.

I also looked into the Auris Euterpe but alas, as it's 4+ years old, there are only close out/used examples available from Serbia. So the search goes on but at the very least the OTL thing is a very valuable lesson. Thanks folks.

Happy listening.

With my suggestion given above, I would like to add that my main headphone amp is a Dennis Had Inspire headphone amp that I purchased new from Moon Audio and it is marvelous with Shuguang 6SN7 WE Plus replica tubes and a round bottom Brymer rectifier tube but over $2,500.00 and am very satisfied with it especially when the xtra power is needed for the more power hungry cans, WTS the little Yamamoto will never be sold. Enjoy the music

Although not familiar with your specific Audeze headphones, I own the LCD2 and the Audeze LCD3s and my choice would be the Yamamoto HA-2 headphone amp. This little amp is amazing and looks amazing as well. I have owned mine for 10 years with no issues, just beautiful music using 2 WE408A tubes. Try it you will like, love it. Enjoy the music

The problem you face is that most all tube headphone amplifiers are OTL(Output Transformer Less) are & not designed to drive very low impedance headphones..
 What you want is a Transformer Coupled amp...
 Also do you have a source like a DAC to drive the amp?
 A lot of folks will recommend the  a Woo Audio WA6 but I do NOT like the 13DE7 tubes it uses..
 If you already have a source I recommend:
at very low budget I HIGHLY recommend the APPJ PA1502A(about $250.00),re- tubed with good NOS tubes(a couple hundred more)...
 At about $900.00 I can also HIGHLY recommend the Cayin HA-1A,leaving $ in your budget for some good NOS small signal tubes,with an eye to upgrade the power tubes later to a pair of Gold Lion or Mullard new production EL84's...
 There may be others but these 2 are the ones I have personal experience with...
You could also go with a Hybrid,using Class A Tube pre drive & Class A solid state power but they don't compare to a true tube amp when it's all said & done...