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I could be wrong, but I think the monochrome signal modulates the g1 elements in this set. I have that chassis and a hybrid chassis from 71'. I don't have the schematic for that, but the one for my hybrid has monochrome video to the g1s and the color difference signals to the cathodes.
Most good setup switches dim the electron guns because if the service man forgets to turn the brightness down the service line will be too bright and burn a horizontal line into the phosphors. I'd try increasing the brightness until the other guns start to light.
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