Alrighty, here's a scan showing the last stage of the video section, and the vertical section is visible below it. I left all that in there because the AGC is controlled by half of the 12AX7.
Again, the symptoms include a washed out picture and virtually no contrast when the picture is adjusted to maximize sound output. Turning down the AGC improves contrast somewhat at the cost of sound, and eventually an unstable image. Brightness on the whole is fair, I suppose. It wouldn't look so great in a well-lit room.