RCA CTC-11 Chroma Alignment Issues

[old_tv_nut]

By happily working, do you mean that if you enable the horizontal you get a normal color picture? Please report exact details and not generalities.

Can you verify that your signal generator and RF modulator are working?
What is your scope bandwidth? If greater than 50 MHz, you can look directly at the inputs and outputs of your test equipment to see if the signals are there. If not, you can try connecting your demodulator probe to the output of the RF modulator to look for a signal.

Your sweep generator must be OK, since you used it to align the chroma bandpass. The RF modulator may need a stronger sweep signal than direct injection into the bandpass amplifier in step 1.

Possible pre-checks:
a) set up for step 1, get the response curve visible. Without changing anything else, add the 330 ohm / 4 mfd cap to pin 5 of V701. Does it change the curve shape or kill it entirely? If the latter, you may need more signal or the added RC network may be defective (e.g., the 4 uF cap is reverse polarity or defective).
b) set up for steps 2 and 3, but don't connect the 330 ohm / 4 uF. See if you have a response that then gets killed by the added RC.