INDUCTOR/COIL 540 to 1600 kHz standard AM broadcast band tuning frequency range, 4-pin chassis-mount layout, 900 millivolts maximum signal threshold, unshielded or zinc-shielded high-Q radio frequency (RF) interstage tuning coil module featuring universal multi-strand Litz wire bank windings wrapped on a low-loss low-profile phenolic form base, engineered to deliver uniform amplification and tight selectivity when paired with a .000365 mfd variable tuning capacitor. Unit Sourcing Compatibility: This component came out of the interstage amplifier networks, receiver decks, and signal conditioning stages of vintage 4-tube and 5-tube Tuned Radio Frequency (TRF) receivers, superheterodyne radio chassis, and custom broadcast monitors. Exact Industry Equals: J.W. Miller 242-RF and Bourns 242-RF