There were two attempts. One was a disaster, one worked, but only temporarily.
Al Newman was KSFO's Program Director from 1959 to 1974. Don Sherwood, the station's bad boy morning man, would quit every few years and then work out a deal to come back.
In May of 1974, Sherwood had been gone for five years. For whatever reason, he told KSFO he'd come back and do mornings only if he could be PD, and they said yes, firing Al Newman.
Sherwood then fired Dick McGarvin and Jim Lange and retreated from KSFO's adventurous MOR format that allowed the personalities significant latitude in picking their own music. Here's a 1971 aircheck of Terry McGovern in afternoons playing, among other artists, Taj Mahal:
Though nobody was programming standards as a format yet, that's what Sherwood did...essentially went back to what they were playing before 1965.
It was a disaster. KSFO, which generally was first, second or third in the ratings, fell to 5th place (behind KGO, KCBS, KFRC and KABL-AM) in the October/November 1974 ratings.
In February of 1975, Sherwood got bored/disgusted/drunk/all three and quit, leaving KSFO, never to return.
Golden West brought Vic Ives down from KVI in Seattle and he essentially tried to put KSFO back together again, but from that point on, KSFO's only really strong ratings books were Spring and Summer, when the Giants were playing, and after the Giants moved to KNBR for the 1979 season, KSFO slumped into a year-round 10th place (give or take) with (again, give or take) a 3.0 share.
In 1980, KSFO hired Allan Hotlen away from KNBR, where he'd been for five years (he was at WIP in Philadelphia before that). This was a period when Golden West was experimenting with talk in some dayparts (KMPC wound up going all talk), but Hotlen held it to 9-noon, and in early 1981, convinced Golden West to let him take KSFO to what Hotlen described as "standards by major adult artists". He explains it in this interview in R&R:
And, for the most part, it worked...KSFO was back in 4th place with a 5.0 share in the spring '81 book, and there was a good solid year before the numbers got soft and they were back to 3 shares.
I can't find specifics on what happened after that (R&R didn't care enough to report it), but by fall of '82, they were a straightforward AC again, and had cratered to a 2.2.
The numbers got a bit better in '83, with a really good summer book (4th place with a 4.2---largely attributed to a good season for the Oakland A's with Billy Martin as manager), but by that time, Golden West had sold the station to King Broadcasting, which took over in December.
It was a low-rated AC from there (and when I say low-rated, I mean 1.8-2.0 for three of the four 1985 books and a 1.7 twice in 1986) until the KSFO/KYA-FM oldies format.