Registration on cameras. Convergence on monitors?

Yes. Thanks for the correction.


Did you have videcon colour cameras? First UK ones
were Plumbicon.

Yes, because you started so late.

The first RCA cameras used vidicons (I think) -- though they might have used
image orhticons.

They later had a four-pickup camera that used an image orthicon to generate
a perfectly registered (by definition) luminance signal, plus three
vidicons.