Treadwell said:
There is no point in using colorbars from another source, even if it is of similar vintage. Colorbars are only meaningful if they were recorded on the same equipment on the same tape using the same dial settings as were used to dub the main program. In theory, all color bars should be the same, but there is a huge equipment and human error factor from dub to dub.
Ah, that makes sense! Thanks!