The vert is probably not "right" & is oscillating way off freq without
sync. Just a red herring IMHO. Deal with that after the video is fixed.
Detectors went a lot up to the mid 60's sets & if we suspected it just
changed it, they were cheap........
The high 145 V makes no sense unless it comes from a voltage divider.
With set running pull the 2nd IF tube & see if it causes noise in
the pix as the pins make/break contact. Work back or forward from
there.
73 Zeno
LFOD !