Look at H1 & H2 on the CTR socket. USUALLY there is a pulsating apx 8 V P-P
from the FBT to run the filaments.
Depending on the design you may have no HV.
If you have one post a READABLE schematic, HV & CRT socket areas most important.
BTW when you see that mung from leaked caps it must be clean it up !
73 Zeno
LFOD !