The TRIUMF RF system consists of a 23.1 MHz fixed frequency driven amplifier with a power capability of 1800 kW. Power is transmitted to the resonator system through a 50Ω water‐cooled line and is coupled to the system by a single coupling loop in one side of the push‐pull resonator system. The resonators are constructed of copper‐surfaced roll‐bond aluminum plates with integral cooling tubes. DC plate power for the four push‐pull 4CW250000A tetrode amplifiers is produced in a single unit rated at 20 kV, 130 A with crowbar protection for the tubes.