The “APC” trimmer capacitor originated by Hammarlund many years ago is still widely recognized as the standard capacitor of its type. Its use is indicated in all classes of equipment where a compact, high quality air dielectric trimmer is required. It was designed to resist effects of temperature, moisture and vibration. Silicone treated steatite insulators are used to insure high leakage resistance.
Brass rotor and stator plates are soldered to brass supports. Nickel-plated phosphor bronze wiper assures positive rotor contact. All metal parts are nickel-plated. Terminals are hot-tin dipped. Tapped brass mounting studs fastened to silicone treated steatite base permit mounting capacitor without grounding the rotor.
Straight line capacity characteristics. Available either with hexagonal collar on slotted shaft to permit rotor adjustments to be made with wrench or screwdriver or with 1/2″ extended shaft for knob control or shaft coupling. “APC-C” Lock Type now also available through distributors. Air Gap is 0.015″ nominal. Tested at 600 V.R.M.S., 60 hertz.