(REPRINT): As far as recableing the DT 880's, I read a thread about useing CAT5 networking cable (available at computer store/ or Rat Shack). I had a gold 1/4" XLR plug and 10' of CAT5 laying around also. This is a super cheap upgrade option and it works. It was very easy as I did not know how the DT 880's were assembled or how to disassemble them. The recableing thread was geared toward Senn 650's and did not go into assembly or disassembly. I found it to be overly easy to do. It took very little time. The CAT5 cable jacket is blue in color and is reasonably flexible and compliant. There are eight wires inside the cable so I paired them up (brown+brown and white striped made up one, green+green and white stripe made up another, and so on). The ends of the pairs were twisted together and tinned with soldier to make up a four wire conductor. The CAT5 is low in microphonics. The cable swap gave little sonic improvement so far as breakin has just started. The bass is a little improved and the highs are very little, better controlled. But the good news is that there is no more "God awfull" coiled cord to deal with. Easy to do, fast, and unbelievibly CHEAP. Also I want to mention that on Saturday I only ran the CAT5 cable to the left earcup. Inside the left earcup there is a solder pad junction to solder wires to it and continue over the headband to the right earcup. I did not do this. For the little bit of 8 inches or so, what would it matter, right? WELLLL I was wrong in doing that. There was a sound improvement, with the initial cable install, but something was dimished also, in both channels. However the balance from left to right was OK. So, not being satisfied last night, I finished running the CAT5 wires over to the right side. WOW, that made a difference. Anything that was ever wrong with the DT880's is now corrected. What was wrong with them was very little. But now they have a pedigree of the highest order in it's price nich and well beyond. Much resolve and little better base. The highs are tamed also. I always wondered if cable changes were worth it or if you had to have Superman's ears to hear the change. But with this change it was worth it argonomicaly wise as well as audible. The new CAT 7 cable has groups of four wires which are shielded as well as an overall shield. It has better transmission qualities too. I might try that next. The DT 880's have bag loads of detail, IMHO, so I am not worried about silver wire which aids in that function. The copper lends itself to more warmth and musicality. If anyone knows what the diameter of CAT7 is to CAT5 and also a comment on the flexibility issue would be welcome.
Audable pluses are (1) twisted wire; Symmetrical field interactions: By using the braiding technique, it substantially reduces any asymmetrical field interactions since no pair (or wire) "rides" on either the inside or outside of the cable more than any other pair/wire.
(2) Copper stranded wire; The copper ads warmth and the stranding aids in flexibility.
(3) Low inductance: It has been demonstrated that low inductance is a desirable quality to have in a headphone cable due to the strong relationship between inductance and signal risetime.
(4) It's CHEAP and EASY to do.
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As far as the new tubes in the Moth goes: YES sir, it is indeed a very smooooooooth amp. The tubes hit the spot perfectly. I haven't done any overly critical listening yet, I try to but each time I just end up sitting there listening with a great big smile on my face, in audio heaven. P.S. The cable comparisons on the DT 880's were done on the SinglePower MPX3.
The Moth was built new and delivered in mid November, to the first owner, so I think that the large capacitors are still not fully broken in yet. The sound is changing as I listen to it yet.
I am not going to have this amp fixed though. I am going to raise it for STUD work. 
