Just a note on Teflon insulation. Teflon coated wire is good but one thing to consider.
The Teflon coating tends to "flow" over time and potentially cause a short in areas where something else is touching and putting pressure on it. Areas like where another wire crosses it or where it crosses over a bracket in the chassis, etc.
We found this when we were qualifying the Teflon coated wire for black boxes that were to be used in space applications. We put them through vibration testing, and numerous hot / cold cycles and found the Teflon insulation would fail in these areas much faster than plastic or other types of insulation.
Granted, our gear will not be going through a lot of vibration, and the hot / cold cycles will not be as severe, but the service life of the Teflon insulation is still much shorter than other types.
Will this happen to you if you use this wire? Probably not in normal use, but the potential is still there compared to other choices, so why take the chance, especially in high voltage tube applications.
Just my .02