The frequency of 610 kHz had been home to the original KFRC for over eight decades, from September 24, 1924 until April 29, 2005. In the 1960s and 1970s, KFRC was a legendary Top 40 rock-music station in San Francisco, but on August 11, 1986, KFRC had changed to an Adult Standards format. On August 12, 1993, it began simulcasting its sister station KFRC-FM's Oldies format.
KEAR call letters
The call letters KEAR were originally assigned to an AM station at 1550 kHz in 1952. Before that, since 1947, the radio station at this frequency had been called KSMO. From 1947 to 1956, KSMO and KEAR had broadcast as San Francisco's only AM classical music station. They billed themselves as the "good music" station. When KEAR stopped broadcasting classical music in 1956, many San Francisco classical music lovers needed to become early adopters and purchase recently introduced FM radios so they could listen to classical music broadcasts on KDFC. In 1956, the KEAR call letters were moved to 97.3 FM. Family Stations Inc. bought the station in 1959, and aired its first Family Radio broadcast on KEAR on February 4 of that year. In September 1978, Family Stations Inc. sold its station at 97.3 to CBS, and acquired KMPX from National Science Network, Inc. At this time, the KEAR call letters and Family Radio programming were transferred to the new frequency, where it broadcast for 27 years.
KEAR moves to 610 AM
In 2005, Family Stations acquired KFRC's AM frequency from Infinity Broadcasting. Viacom, the parent company of Infinity Broadcasting, was in the process of acquiring television station KOVR in Stockton, California, and needed to sell the AM station to meet Federal Communications Commission ownership limitations. On April 29, 2005, 610 AM began simulcasting Family Radio programming. Shortly thereafter, Family Stations sold its 106.9 FM frequency to Infinity Broadcasting. The Oakland Athleticsbaseball team, which had a contract with KFRC to carry its games, continued to broadcast on 610 AM through the end of the team's 2005 season. On October 17, 2005, after the season ended, the KEAR call letters were transferred to the AM station and 106.9 became KIFR, later to become, ironically, KFRC-FM. Coincidentally, all three of the frequencies which formerly had the KEAR call letters are now assigned to Entercom, which acquired CBS Radio in 2017.