MOST of the time......
Waveforms in manuals show 2 complete cycles. Some newer scopes
@1975 + have a setting for it like the Sencore. It may be called
line & field or TV hoz & TV vert on the time base SW.
Wave forms are pretty generic. If you can look at them on a running set
with manual it would help you a lot. Then write down the time base.
And dont forget the isolation transformer !
73 Zeno
LFOD !