Sentinel tv400 circuit change and help

[Davala]

Found something interesting in the video output circuit on the tv400. Both the riders and my set show the 1meg resistor from the grid of the 6au6 video output tube going to the contrast control and through the wiper to ground. The SAMs shows the 1 meg resistor going straight to ground.

The way it's connected the contrast control controls the cathode and grid of the tube. So it makes sense that when its low you will also have low volume and sync output? The SAMs shows the resistor connected to ground and changing the contrast control will not affect the grid of the tube.. Should I modify my set to show what SAMs says it should be?

I'm currently going through the resistors in my set to cure some issues that recapping didn't fix. Got a double image vertically and you can see the flicker of the scan. I assume that's running slow. The horizontal is causing me the most trouble. As the set warms the oscillator drifts for about twenty minutes making me adjust it every minute. Horizontal and vertical lock are also very touchy. I'm currently going through the SAMs and organizing my replacement resistors for the video output, sync output and horizontal and vertical oscillators.

Any advise on anyone's issues with working on the sentinel tv400?
Thank you! Matt Davala.