[old_tv_nut]

It looks like the video amplitude at the kinescope is about right (schematic says 38 v p-p, If I'm reading the scope scale right you have about 25 v, but that should vary with contrast setting). I think you should measure the signals in the sync separator. Schematic says input to sync sep, pin 4 of V119 6SH7 should be 35 v pp, output (Pin 8) should be 75 v p-p. Check the output first, if it's not good, check the input. If it's not good, check the signals around the 1st sync amplifier.