KZNB

The station's original transmitter building and radio tower[2] (since destroyed) were featured in the film American Graffiti.

On Tuesday, January 10, 1950, at 6 a.m., 1490 kHz commenced broadcasting as KAFP, which stood for 'Krowing Always For Petaluma,' associating the city with its poultry-processing status.

The format remained relatively the same, with a mix of news, talk, sports and music shows geared toward the Petaluma community.

At that time, October 13, 1963, a gentleman became closely associated with KTOB's mostly-MOR (middle of the road music) programming over the next several years, and eventually became a part-owner: Ron Walters.

Notable air talent in this era included Larry Chiaroni, now a news anchor and reporter for KCBS San Francisco; John Emmett, who later became play-by-play broadcaster for the AAA baseball Richmond Braves; Roger Coryell, longtime San Francisco jazz host and programmer; Ken Korach, who is now the play-by-play announcer for the Oakland Athletics; and Alan Stock, a nationally known radio talk show host at KXNT in Las Vegas.