Bryanhod: I have often had to wait a fair amount of time to get a good deal on a long IC, whether RCA or XLR, in 20-30' lengths. But there are so many people with balanced components today that XLR cables are in abundance on the used market in the typical 1-2m lengths.
Pops: Geez, it's been awhile since I called anybody by that title. Hmmm, maybe you can adopt me. 8-) Oh yes on the Mullards, I love these things. I just heard this week from another CAT amp owner who tried Mullards and he too liked their result. They are magic in the CAT preamp, amps and the Aesthetix line and phono stages.
Concerning the MIT cables, when I had the 350 Ref Proline, I also had a 30' XLR M1 on loan. I had this for over a month as the dealer told me I had to break it in. A month later, I still much prefered the 350 Ref Proline as this had more dimensionality and body to the music. The M1 was closer to the analytical zone for me. But I do not recall much difference in tonality. My system then (to evaluate these MIT cables) was BAT 31SE and Wolcott monos driving Magnepan 3.5s.
Last year, I re-arranged my room and thus needed a longer cable than the 20' 350 Ref Proline so I changed to the Evo when I found one that was 25'. And the CAT amps that I had by then are single-ended only so I got rid of using the XLR-RCA adaptors as this Evo was RCA terminated.
It was just a couple months ago that I removed the 350 Evo to be replaced by the Dominus and this change was huge. It will be in my system for a long long time. If you think the MIT extends well into the frequency extremes, there will be a huge smile on your face when you hear the Kubala-Sosna Emotion or Purist Dominus or even Venustas for that matter, directly against the MIT. The Dominus is so very impressive in the lowest octave.
If you are ever in the Minneapolis area, send me a note and you're more than welcome to stop by.
John