I agree.  I sold my AD2000X, but kept the AD2000.  I could never quite warm up to the 2000X and I tried pretty hard!

  I gave the Tele's a personal "score" of 10 out of 10 with my LCD-3's, LCD-X's and HD800's.  And a 10 score is very rare with me.   Superb sound.  You should probably ask if there are any headphones that they would NOT work with - likely a much shorter list.

  Yup.  See my earlier posts.

  That's the one - I have the earlier generation unit - I believe it was called the Anker Astro 3. You just use the port that delivers the correct voltage.  Pretty straightforward.

I've used an Anker portable successfully.

Sorry, I have no experience with the ican. The T1 does seem to like my tube amps though.

  Yes and it sounds very good. I'm currently using the idsd as a DAC in a portable setup feeding to the ALO Rx Mk3-B+.  I find the idsd a touch bright by itself, and the ALO smoothes this out a bit.   The T1 is (so far) my favorite headset with this combo.

  Well, for me at least, yes 

Yesterday I received 2 sets of Raytheon tubes:   1. 1967-1970 JAN-5654, Black Plate, Top O (these have Red/Orange silk-screened markings (eBay $36.95 with shipping).   2. 1944 Military Spec JRP 6AK5; Side Getter and Oval Plates; gray/white markings (eBay $73.50 with shipping).   I...

Will do. I'll roll them in as soon as they arrive and report back.

      Coudn't decide - bought 1 set of each of these 

  I would like to know this too!   There are several options on eBay - Black plates; Gray plates; 1944 Mil-specs (more expensive); etc.

I'm sure socket savers are a very good idea, but I can just now barely fit the Pan Am into the ALO zipper case (made for the Pan Am + Passport - I use it portably) with the tubes left in.  With savers, no go.   I'm banking on ALO being able to fix/replace the sockets after I screw them up  

  There are several of the Telefunkens currently listed on eBay for around $50 - $60 a pair.   I didn't mean to imply that there is so little difference that it's not worth it.  Quite the contrary, the Telefunkens are well worth it (to me). What I meant was that almost all of the tubes I've...

  I like them all with one set of headphones/DAC or another, but I think the Telefunkens sound best (slightly!) to me.    You might also want to try the Cifte tubes if you haven't already.  They are quite reasonable and very good.