Abstract: A corona discharge beam therapy system adapted to project the beam onto the skin surface of a living body overlying a problem region, the beam serving to relieve pain and to obtain other beneficial effects. The system includes an energy-generating unit in which a radio-frequency carrier is overmodulated by a sonic signal to produce periodic bursts of radio-frequency energy whose repetition rate corresponds to the frequency of the signal. The output of the unit is fed to a tank circuit tuned to the carrier frequency and housed within the barrel of a portable applicator gun. Supported within the barrel and coupled to the tank circuit is a discharge electrode whose tip is adjacent the mouth of the barrel whereby a corona discharge beam is projected from the tip. The tank circuit which includes a tank coil and an output coil coupled to the tank coil is formed by a series of Pie sections in spaced relation mounted on an insulating tube having ventilating slots in the spaces between the sections.