The heart of each Loop Tuner is this MFJ-19 low loss butterfly loop tuning capacitor with no rotating contacts. The capacitance is variable from 12 to 67 pF.

This low loss butterfly loop tuning capacitor has a voltage rating of 4200 Volts rms. Built-in insulator feet give 1-inch of space under the bottom of the capacitor allowing convenient mounting and high voltage insulation. Solder lugs are provided on the stators and rotor for easy wiring.

Only 6 inches long, 3 inches wide and 3-½ inches tall, The MFJ-19 is small enough to fit into small enclosures. With a 2-½ inch long ¼ inch diameter insulated nylon shaft, a knob can be easily added to aid in turning the capacitor rotor.