It is described a rectifier stage (129,229) for rectifying an input AC voltage to a DC voltage, the rectifier comprising: a first input terminal (105,205) and a second input terminal (107,207) between which the input AC voltage is applied; a first thyristor (109,209); a second thyristor (111,211) connected in series with the first thyristor, wherein the first input terminal is connected between the first thyristor and the second thyristor; a first diode (115,215); a second diode (117,217) connected in series with the first diode, wherein the second input terminal is connected between the first diode and the second diode; and a first output terminal (119,219) and a second output terminal (121,221) between which the DC voltage is achieved, wherein the first thyristor and the first diode are connected to the first output terminal and the second thyristor and the second diode are at least indirectly connected to the second output terminal. Further a converter and a converter assembly are described.