Ok. Let’s try this again…RCA 9TC240 Alignment

[Penthode]

And can you reduce the sweep speed slightly on the generator (little knob on the lower right from panel) so that the photos show a bright clear display for us?

And I should add that on late 40's RCA TVs, almost all have the 5.1 ohm series filament resistor to the 6AL5 discriminator. I have restored about a half dozen of these sets and four of the resistors were bad or became bad shortly after coming back to life. So be prepared if you loose sound to first look to see if the 5.1 ohm is bad.