As an aside, in case it was not a typo, it was KEWB, not KWEB. KEWB in San Francisco, KFWB in LA and KDWB in Minneapolis were Crowell-Collier sister stations.
I made that typo two times. Found it once. Damn! I hate it when that happens. Yes, the summer of 1966 KEWB Oakland, CA flipped from T-40 to talk leaving KYA and the automated KGO-FM playing rock music in The City. Those of us that could also listened to KFRC but it didn't come in very listenable in the extreme north bay. KLOC was also on the air but their signal wasn't getting into the north bay very well either. They had that weird ticking sound in the background during song breaks - kind of like the teletype background played during news breaks on some stations.
P.S. KEWB had their offices in Jack London Square in Oakland during this time and used Oakland as their COL. I never heard them identify as a San Francisco station.