OK, finally set aside some time to further troubleshoot, take some waveforms, and voltages. All peaking coils' continuities test good. Pretty much replaced all larger value caps in the video agc sections and no change. Checked all grounds again and they appear fine.
Voltage checks on V4 ok except pins 8 and 9 which were about 70 and 50 v too high, respectively.
Voltage checks on AGC V6 appear ok, except maybe pin 7 which was about 10v high. I need to mull over this data to figure out what it means, but I think there's a connection between the AGC (as someone else may have alluded to earlier) and the 1st video stage...
Pin 2, V4. Video is reversed here, but not very much noticeable smearing, as opposed to the first stage of V4. Hard to lock the picture due to lack of sync when injecting video at this stage.
Some waveforms, starting with the AGC. All appear to look normal to me.
Pgs 2 and 3 can be referenced for the waveforms here:
https://earlytelevision.org/pdf/rca_...ams-0818-2.pdf
