SPECTRUM is manufacturer of Variacs or Variable Auto Transformer which provide continuous control over AC output voltages. This Variable Auto Transformer provides an output which is free from distortion and is suitable for testing of sensitive electrical appliances or equipment. These Variable transformers are designed using cutting edge technology which ensures a consistent linear regulation of output voltages in a controlled manner. We are supplier of Variable Voltage Auto Transformer popularly called as VARIAC or Dimmerstat, having a movable carbon tip fixed to a brush-arm sliding on a silver plated commutates. The Rotation of the brush-arm is done by either manual or motor drive which delivers an output voltage from zero to or above line voltage. We manufacture these Variable Auto Transformers.