In regards to the scope trace of the horizontal discharge tube plate, it looks like the trace I show is correct and the service manual is wrong. Later sets using the same exact circuit show traces like the one that I photographed.
Also, C219 that is shown paralleling fuse F1 is partially explained by Wallace's Telaides. It seems to help the fuse respond only to the average DC current and not the large peaks from the horizontal sweep. Also, they moved one end from the +180 to the +170 to help the horizontal oscillator start more reliably. I didn't think a fuse had a significant impedance, but it must if this helps.
John