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Among General Electric's Plumbicon color cameras (four tubes all), it seemed the PE-350 and PE-400 elicited better pictures than the PE-250. Many have noted about the varied picture quality of PE-250's, especially at ABC's Vine Street studios in Hollywood in the late 1960's (the ill-fated Joey Bishop Show, for example); but also in use at local stations like New York's WPIX - but another New York station that had PE-250's, WOR-TV, seemed to make out better, having seen vintage late-1960's episodes of William F. Buckley, Jr.'s Firing Line online. (Unless those cameras had gotten converted to PE-350 standard performance, as many PE-250's had been, from my understanding.) This seems to go along with 'austvarchive's' point about seeing "some woeful pictures out of all models of cameras, yet some of the best pictures from a same model at a different station."
Or sometimes you could get both good and bad at the same station. I saw wildly varying picture quality - some good, some not-so-good - among Norelco PC-70's within the same show on a few 1970's editions of WABC-TV's Eyewitness News. This was also true in the early 1970's on some shows taped at certain NBC studio stages at Rockefeller Center - on one RCA TK-44A, the blacks would be quite purple/reddish, while the others in that studio would be black as black could be.
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