CTC-5 Westcott restoration

[old_coot88]

In your screen shot it looks like the chroma level, color sync etc. are good. So turn the color control completely all the way down. Forget about color for now. It's a completely separate system from the luma (B&W video) chain. With the color off, the set should show a normal B&W picture.
The luma chain is what you need to work on.
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On a related note, remember that in a tube type color set, luma goes into the CRT via the cathodes; color goes into the CRT via the (G1) grids.