The flyback winding (now open) had turned into a solid conductor, creating a single winding "donut current clamp", disabling the entire stage.
To be sure, I removed the arced to death winding on a CTC20 fly that I had lying round.
The CTC20's yoke/damper winding tested poorly on the ring test, H-out and secondary windings were open. When the donut was cut off, preserving the primary windings, the ring tested good with a peak reading on one of the middle ranges.
I did the same to the Philco and saw little improvement, so I lifted the ground on the "pulse winding" which was not at the bottom like an RCA fly but wound under the primary windings. This was it! Ring was reading well into the good zone on the second highest range. Prior to this operation, dropped there as if it were a null or trap.
Flyback section.JPG