Union City Filament manufactures toroidal filaments and heaters. These configurations consist of single helix, single helix center-return, and double helix coils wound cylindrically and then formed circularly. Toroidal filaments and heaters are often used as cathode heaters for microwave tubes or in scientific research applications. Leg formations, coil diameters, wire diameters, numbers of turns, and turn spacing can all be modified to meet application requirements.
Typical material types include tungsten, 3% rhenium tungsten, and high temperature molybdenum. Toroidal coils are available coated in one of our alumina coating blends.