Here's a cleaned up and more legible schematic. The entire sweep and HV section is different than what I've seen in the Sams, including the damper and HV Regulator tubes, which had the numbers illegible in the set. B+ is lower than the Sams version, and it's exactly what I have measured, so hopefully things will make more sense now
. I'm going to start again using Tom's suggestions and the new schematic and values and see where that leads.
Zenith B4519WKT - 1 (PS, Sweep, IF)
Zenith B4519WKT - 2 (Video, Chroma, Sound)