KTVU presented their news shows as sober, professional, no-nonsense business right from the start. Presumably the 10:00pm start time was the best way for the fledgling show to compete at all in a very dense news market.
July 1976
There was never, that I remember, a Happy News lapse at KTVU. But neither did they, as local stations did in the 60s, present themselves as so deadly serious that they seemed dour and unfriendly.