A core for an inductance coil adapted to provide a variable inductance for inductance correction or the like. The core utilizes centrally located sleeve comprised of non-magnetizable, polymeric material threaded to receive a matingly threaded cylindrical core adjusting member.
A sintered powdered aluminum core for an inductor used in the tuning stages of high frequency equipment is disclosed. Such cores have threads ground on them having sharp thread profiles, as opposed to the flat thread profiles produced by screw machines, and plating the cores produces superior eletrical properties.
