Abstract: A unit is disclosed for individually controlling power to multiple loads, such as lights. The unit has multiple phase control channels, each having thyristor control of current to the load, triggered by a ramp-and-pedestal firing circuit employing a unijunction transistor with a capacitor at its emitter. The system has a circuit providing a pulse to all of the firing circuits to discharge the capacitor synchronous with the AC line. Another circuit generates a sinusoidal compensating signal for all of the firing circuits.Each of the load channels has its own power control. In addition, a master control allows the power on all channels to be changed together, with the proportion of power in each channel set by its individual control.The unit is housed in a box having a base sheet shaped to form front, bottom and rear walls, with side walls attached at opposite edges of the base sheet.