Although 6XC, located in San Francisco, was licenced to Lee De Forest, Incorporated, it was generally referred to as "The California Theater station", which is where its transmitter was located, and where most of its programming originated. In December, 1921 ownership was transferred to the Atlantic-Pacific Radio Supplies Company in Oakland, and its call was changed to KZY. The station was deleted in January, 1923.
San Francisco Chronicle, June 21, 1920, page 4:
Melody by Radio Given First Trial
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Electrical Home Hears Concert By Wireless
Melody by radio made itself heard in San Francisco for the first time yesterday, when the Sunday morning and afternoon concerts of Herman Heller's orchestra at the California Theater were transmitted by wireless telephone to the Electrical Home in St. Francis Wood.
Each number on the programme was heard in all parts of the home, which was taxed to its capacity.