Woo Audio - Best headphone amps ever?

Woo makes undeniably incredible headphone amps.  I would like to do a side-by-side comparison between the Woos and the Angstrom Stella headphone amp.  If anyone has done this, I would be curious to hear your POV.  

for my Senn HD600 phones some recommended the Woo WA6se or WA7tp or Woo WA22. Not sure if these will drive speakers as well.  

Sad to see Cavalli go, they made excellent headphone amps. I am trying an Apex Teton amp out now and it is phenomenal with the Focal Utopia 'phones. It may even beat the Stellaris.

Cavalli Audio now out of business! https://www.head-fi.org/threads/cavalli-audio.862917/

Erik, I like the USN CEP 6922 tubes the best with headphone amps. They pop-up on Ebay occasionally. If you want something a bit more interesting, and less expensive, get some adapters and use 6F8G tubes in the Cavalli. They are quite a treat, though they can be noisy. Very sweet sounding tubes.

Hi Erik: We all have different opinions as to what we like. I remember a well known critic raved some much about a dac that I went out and purchased one. Fortunately, I had 30 days to try it. I returned it within the week. One of my audiophile buddies agreed with me that in my system it was awful.

Hi Jeffery!

Any particular tubes you'd like to recommend in the Liquid Glass?

Best,

E

Cavalli Liquid Glass will beat the Woo's pretty handily, and Donald North Audio's Stellaris amp will vaporize them.  Eddie Current's Balancing Act is an honorable mention.

I had the Woo headphone amp, the least expensive one. Very simple, elegant and well made, gorgeous chassis. Certainly replacing the original tubes is necessary to get the best sound. I also wrapped both transformers with mu metal and used two count em Herbies tube dampers per tube, one for the glass near the getter, the other on the base. Two Sylvania Badboys and one WWII Tung Sol rectifier. Fuse by Audio Magic.

I had a Woo WA22 for a while. It was a good amp, but nothing special. I prefer the Headamp GS-X Mk II for solid state and the EAR HP4 for tubes (both of which I own).