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Well, the schematic says that the ptp level going into the final video amp p2 (12by7) is 3v, and composite is only 1v, but you should see SOMETHING, even though you are feeding in low amplitude there, also, it's best to remove the det tube 12au7 when you feed in video at the test point p2 (12by7) , so it's not loaded down, & if you have an o-scope, you should see some kind if inverted video on the cathode of the CRT, as indicated on the schematic.
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