[blue_lateral]

I'm sure you need a demodulator probe here. In this type of a sweep, you use the same ramp (sawtooth) generator to sweep the sweep generator and the scope beam. In the diagram you posted, this is the ramp generator in the sweep generator, and is jacked into the "external sweep" or "x axis" on the scope. This is how it is usually done.

As the frequency of the sweep generator goes up, the beam goes right, they're synchronized. So far so good. A point further right on the scope corresponds to a higher frequency.

Now you need a response curve. As the sweep generator passes through the passband of the IF strip, the signal level goes up and down. If there is any AVC or AGC or anything like that, it must be disabled, because it will try to compensate for the level going up and down. The alignment instructions should tell you how.

As the level goes up and down, this becomes an AM signal, modulated on the sweep. To recover it, you need an AM detector. If you were aligning an AM radio, or a video IF strip, there would be an AM detector already there in the set, and you could use a regular scope probe after the detector.

Since this is the sound strip, I suppose the detector is FM (and useless for this procedure), so that is why I think they have you picking up the signal just before the detector. You'll need a detector probe.

Any demodulator or detector probe as found on an old scope should work. I made my own for aligning chroma in color sets. Here's the schematic for the one I made. It's the one on the bottom.

John