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I have no information, but from what those control labels say I'd bet I could set it up properly using a scope on the output and some references to the NTSC standards for what the levels should be for R, G, and B.
From the schematic posted by John Folsom, it appears the phase is set by fixed components in a synthetic delay line (upper right). Unfortunately, the schematic is too fuzzy to read the values, so it might have something to do with the adjustable LC's at the bottom also.
Anyway, it seems you would look at the red, green, and blue bars and adjust the corresponding "Y Gain" for the correct luma level, and the corresponding "Bar Sat" for the correct chroma level. I think this would fix the primary and secondary color bars.
The overall chroma gain sounds like it affects subcarrier on both color bars and I/Q/ whatever, so maybe you would need to adjust it first. If it affects burst level, you would adjust it for that, and then adjust the R, G, B controls.
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