Congrats on the new call! Interesting suffix, does it represent anything significant?
73 John AF5CC
A few reasons why I changed:
1. I decided to do it now, after thinking about it for a long time, before the $35 fee kicked in.

2. After almost 19 years as WW7KE, I got sick and tired of my call being misunderstood during SSB contests. It was time for a change.
Why W7XTV?
1. I wanted a W7 call. I am old-school enough that I believe one's call should reflect his/her home district.
2. After 52 years as a ham, I wanted an "old timer" prefix. Just because. I've held 2x2 calls since 1990. As an Advanced, I'm not eligible for a 1x2 or 2x1, and I don't want to go through that "scavenger hunt" even if I ever do upgrade to Extra.
3. "Whiskey Seven Xray Tango Victor" should punch through in SSB contests much better than "Whiskey Whiskey Seven Kilo Echo" did. Hard consonants tend to be more audible in QRM, at least from my experience.
4. The "TV" comes from the following: I'm working on a design for a low-resolution, low frame rate TV system that can be legally used on HF in the US, with a 6 kHz bandwidth. This is similar to work that has been done the last few years in Australia and the UK, but they're allowed wider bandwidths. I also remember the Medium Scan TV effort of the 1978-80 era that was not successful because it was too wide, and the technology was not there yet. It's in the early-design stage and will be all software. At least in theory, it is doable with the right line and frame rate. I work on it whenever I have the time.
4a. The "X" in my call reflects the pre-war experimental TV callsigns that went away in 1945. However, this call would not have been assigned in Arizona in that era because it was in the 6th district before the war. Oh, well.