DZBB-TV, Channel 7 (analog) and Channel 15 (digital), is the flagship TV station of Philippine television network GMA. The station is owned and operated by GMA Network Inc. with its studios are located at the GMA Network Center, EDSA corner Timog Avenue, Diliman, Quezon City, while its analog and digital transmitter station are located at the GMA Tower of Power, Tandang Sora Avenue, Barangay Culiat, Quezon City. GMA operates on weekdays from 5:30 A.M. to 12:30 A.M., Saturdays from 5:00 A.M. to 12:15 A.M. and Sundays 5:30 A.M. to 12:40 A.M. and on truncated hours during the Paschal Triduum of Holy Week. The station serves as the originating channel, and also acts as a master control to the network's national television programming, which broadcast to all its regional stations through the GM