A dynamoelectric machine includes a rotor having a rotor shaft; two flux carrying segments rotatably disposed on the rotor shaft; a field coil disposed between the two flux carrying segments, the field coil having a pair of coil leads; an insulative member disposed at one end of the shaft; a pair of slip rings longitudinally spaced on the insulative member and having respective coupling terminals; and a diode having a pair of diode leads, each diode lead electrically connected to one of the pair of coil leads of the field coil and to one of the respective coupling terminals, the diode configured to suppress electrical noise as a result of an interface between the pair of slip rings and respective brushes.