[Penthode]

Show some pictures of the response with markers and we will set you straight. Forget about doing it any other way. Feeding in composite video and trying to adjust to to that will not work. You are getting there and all you need is patience and perseverance. And the results when done right will amaze you because this set delivers superb pictures.

The signal level will be low because of the shunts across the IF stages. You must turn the RF level up. The main thing is you must ensure is when varying the RF level, there should be no change to the shape of the RF response curve. Only the amplitude of the response curve will change. Make sure the ground connections are good. And show a picture of the sweeper generator panel so we may see the settings.

Patience!