BandDirector old bean, like most novices you do not know how much you don't know. Following some threads here may make it look easy but things are very involved. You need to be very methodical.
Here is a link to a very good talk presented on youtube by w2aew, someone that is very knowledgeable about many electronics subjects. Check out his collection of videos on many aspects of oscilloscopes and other test equipment.
https://www.youtube.com/watch?v=KYEMPm0c9kY
Not everything on youtube is good, anyone can put a video there, no one fact checks.
That B&K scope is a dual channel 10MHz one as far as I can tell, it should fill the bill for what you need. Whether it is in good working shape is an unknown however.
If I haven't already suggested this in a prior post, this is a good guide to understanding TV technology.
https://worldradiohistory.com/BOOKSH...r-5th-1955.pdf
BandDirector, you must realize that these forums are not to provide a private unpaid tutor in TV servicing. To learn everything you need to know would literally take 1000's of posts. Perhaps that is why so few respond to some threads, they just don't have the time and energy to get involved in a thread that will stretch on for a year(s).