B&K of that vintage = quality product.
I made my own pattern generator years ago - it doesn't do color bars, but is sufficient for convergence.
http://www.edn.com/archives/1998/120398/pdfs/25di.pdf
(page 3 has the schematic) It has a few errors in the original schematic I have from the actual magazine, but they've corrected them on the online schematic.
For any color stuff, I'd borrow my Dad'a VA62.
Cheers,