 January 1938 brought KROY an affiliation with the Columbia Broadcasting System; the network had aired in Sacramento over KFBK until that station affiliated with NBC.As with most stations on 1210 kHz, KROY moved to 1240 kHz on March 29, 1941, with the enactment of NARBA.The FCC rebuffed a bid to upgrade to 10,000 watts at 1030 kHz in 1942, but it did permit the station to increase to 250 watts the next year.