Okay, can't move forward until I clear this up

[TinCanAlley]

Which connections are my cathodes and G1s? I know which are the G2s (the higher voltages of 400 - 600V), but the ones I've been thinking are the G1s might not be. Take a look at the for the CRT schematic and the circuits feeding it. Are those in order of cathode, G1, G2 and focus? Do they represent the actual configuration inside the neck of the CRT? If so, then the G1s should be the 36.4V?

If that's correct, then how exactly does the cutoff work? Is the G1 supposed to be a fixed voltage? If not, what makes it change? If those are the G1s in my setup, then I see no way for the voltage to change. They get their voltage from a step down of the 240V Boost and in that circuit there's nothing but the 2404V boost, two resistors, a capacitor and a spark gap. From there it goes directly to the CRT socket.

And if the G1s are the 36.4V leads, that makes the video output transistors the feeds for the cathodes?

If color of wires helps, there are three white wires with stripes (a red, green and blue), three yellow wires with stripes (a red, green and blue) and a red wire, green wire and a blue wire. I know the whites/stripes are the G2s, browns are the heater leads and the black is the focus.

I guess I'm still a little too new to all this. I thought I had this correct, but if I don't, I've been doing things wrong and looking at the wrong things.