This one is a little different. Usually the neg of that cap goes to GND.
Look off the negative, it goes to the #1 130 V source. There is usually another cap to GND from the 150.. Probably on the PS part of the schematic.
HINT on most Sams there is chart showing how many points a source goes to
This is very handy at times when you are unloading things.
Anyhows the value of cap I have seen is 4.7 OR 10 MFD. I have seen a few
open coupling caps in the video chain on these sets.
To wrap it up can you post a pix of the symptom ?
73 Zeno
LFOD !