[old_tv_nut]

Can you explain why you have two waveforms for the output of the first sync amplifier? H and V rate? Neither one looks very much like the waveforms on the schematic. The first one, that appears to be H rate, appears to be inverted compared to the schematic.

Picture 3, input to sync separator, seems to have a lot of video. (On the schematic, it shows mostly sync pulses with a little video leaking through.) As a result of the excess video, the output of the sync separator has a lot of video also - it should be purely sync pulses.

I would start by checking the first sync amplifier. Check DC voltages. Check component values. Do you have a known good tube to substitute?