The introduction of the vertical interval reference signal (VIRS) largely did away with the need for interchannel hue adjustments on NTSC receivers. For VIRS background, see:
http://tig.colorist.org/pipermail/ti...ry/010331.html. I think that hue controls were still provided, perhaps to cover transmitters not using VIRS, and because to some extent they were expected.
I used a Fisher PC-225 high-resolution receiver-monitor in the USA from 1986 through 1996, and I don’t recall ever using the hue control apart from playing around with it when it was new. I haven’t kept the manual, unfortunately – it went with the receiver to its next user in 1996. Even the previous fairly old rental TV that I used during 1985 did not require regular hue adjustments. So it would appear that VIRS did a pretty good job.
Cheers,