RCA 630TS - no high voltage

[dcl0]

I'm stumped! I've been working on an RCA 630TS for about 3 years now (I treat my radio/TV repair projects like someone might do a jigsaw puzzle. I leave it on a work table in the spare room and work on it off and on when the mood strikes). This one originally came from shore road in Great Neck Long Island according to the service tag. It was probably stored in a humid environment all its life but the chassis didn't look too bad. Before I could even think about testing it with power, I had no choice but to change out all the leaking electrolytic caps, all the wax paper caps (all later tested as shorted at well below their rated voltage) and most of the resistors which had drifted upward. After all this, I turned it on and got sound (reception) from the digital converter box, but no picture.
The picture tube tests well into the green (Heathkit TC-2) but the high voltage as measured at both the top of the doorknob capacitor and the anode button are only a laughable 400 volts. I confirmed that my high voltage probe (Heathkit IM-18 with high voltage probe) was working correctly by measuring known ~300 volts elsewhere on the chassis. I've looked everywhere I could think of in the high voltage circuits for a fault and cannot find any.
The ringing test of the flyback with a Sencor VA62 gives me only 4 rings with everything connected, but 24 rings with everything disconnected. I can't really pin down which leg is dragging the rings down because its all interconnected (only pin 3 through the high voltage rectifier socket is a separate circuit). However I disconnected, in turn, various points in the high voltage section and measured resistances throughout the primary winding, damper circuit and high voltage winding and all were almost spot on. Continuity was also what it was supposed to be where it was supposed to be. I disconnected the yoke and that resistance was within spec.
I've swapped out 3 sets of damper, rectifier and horizontal output tubes (all I have) with no effect. Voltage checks give me 325 volts on the cathode of the damper tube and -101 volts on the grid of the horizontal output tube. The cathode current of the horizontal output tube is 90 mA.
http://www.videokarma.org/attachment...1&d=1676509703
Shown below is the oscilloscope trace of the grid of the horizontal output tube.
http://www.videokarma.org/attachment...1&d=1676509706
I've taken oscilloscope traces of everything shown on page 269 of the RCA-Victor Service Data 1943-1946 (available for free download on the Worldradiohistory.com website) except for the high voltage/pulse stuff, and it matches except for the screen of the horizontal output tube and the cathode of the damper. The peak-to-peak voltages are OK, but the peak profile is very different.
Screen of HOT
http://www.videokarma.org/attachment...1&d=1676510127
Cathode of Damper
http://www.videokarma.org/attachment...1&d=1676510127
Can anyone point me in a direction to look next?