Simple diode circuits, clipping, clamping, rectifier. The controlled three-phase bridge rectifier uses thyristors in place of diodes. Before the development of silicon power rectifier diodes, cuprous oxide and later selenium was used. The design includes a four-quadrant current source rectifier and a voltage source inverter. Commonly used for rectifier, Schottky, and other diodes. Some sources define silicon-controlled rectifier (SCR) and thyristor as synonymous. With the switch closed, it acts like a voltage doubling rectifier. Early tube amplifiers had power supplies based on rectifier tubes. Two thyristors are connected as a phase controlled rectifier (PCR). This breaks the parasitic silicon-controlled rectifier (SCR) structure between these transistors. Fitted with electronic regulator/rectifier unit. Other audible effects due to using a tube rectifier with this amplifier class are unlikely. With the switch open, this circuit acts like a normal bridge rectifier. The AC power cable is connected to the rectifier input terminals. A bridge rectifier, called the rotating rectifier assembly, is mounted on the rotor.