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Yes C-1 is Zeniths term for composite video. Some sets
even have a "C-1 adjust" pot.
Grounding the ABL base proves its NOT coming from there so ignore
all between the ABL base & tripler.
Depending on the scope I was using I almost never used
DC only AC since I was looking at waveforms. On my sencore
there was a built in meter to speed things up.
Also be sure all your calibrations are set. The are the red
knobs are set to "cal". Some have an arrow to show which direction
to turn them.
If the scope is dual trace you can use sync on B to stablize the
waveform. Hook the B channel probe to a clean hoz signal
such as the hoz drive collector, this may get rid of the multiple
traces.
73 Zeno
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