DZBB-AM  DZBB (pronounced DZ-double-B; 594 kHz) Super Radyo is a round-the-clock news-talk radio station based in Diliman, Quezon City, Philippines, serving Mega Manila and neighbouring provinces. It is the flagship station of the Super Radyo stations, and one of the assets of GMA News and Public Affairs, the news division owned by RGMA, a subsidiary of GMA Network Inc. The station's studio is located at the GMA Network Center, EDSA corner Timog Avenue, Diliman, Quezon City, while its transmitter is located at Barangay Panghulo, Obando, Bulacan. DZBB marked its inaugural broadcast, as the station's signal (although it was static marred) was wafted on the air for the first time on March 1, 1950 by Robert "Uncle Bob" Stewart, in a small office space in Calvo Building, Escolta, Manila with mostly second-hand equipment and an old, surplus radio transmitter. The station was then broadcasting on the frequency of 580 kHz. Despite the scarcity of new broadcasting facilities, the station has scored many milestones with its news, Congressional coverage, breaking news, exclusives, and blow-by-blow accounts of major national events. It was also a pioneer with trendsetting shows such as "Camay Theater of the Air", "Lovingly Yours, Helen", "Kahapon Lamang", "Tawag ng Tanghalan", "Newscoop", and "Kwentong Kutsero". Some of these shows eventually became television shows. DZBB was also the first to air live coverage of not only news and public affairs, but also entertainment and educational programmes. In 1957, DZBB moved to its new and current home at EDSA, Quezon City. Due to the success of DZBB, Stewart ventured into television on October 29, 1961 as DZBB-TV Channel 7 with the branding of RBS-7 (now known as GMA-7 Manila). The station was seized and closed in September 1972 due to Martial Law. Two years later, due to changes in media ownership laws, Channel 7, DZBB and their other sister provincial radio and television stations were eventually sold to the triumvirate of Gilberto Duavit, Sr., Menardo Jimenez and Felipe Gozon. At the same time, DZBB returned to the airwaves under the branding "Dobol B", and became a music-personality radio station.