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

[old_tv_nut]

Originally Posted by Electronic M

the one for my hybrid has monochrome video to the g1s and the color difference signals to the cathodes.

If this is true, it's the first time I've heard of a design like this. Tube sets for years (and I thought hybrids also) put color difference on G1s and mono on cathodes. Then CRTs got unitized guns (common G1 for all three colors), and the color had to be matrixed into three cathode drives (R,G,B).

Edit: besides, TCA's schematic clearly shows fixed voltage on the G1s.