These stem assemblies consist of a glass wafer containing a series of hermetically sealed leads and, where required, a glass tubulation. The metal leads provide electrical feedthrough for evacuated tubes and assemblies. A tubulation permits easy attachment to a vacuum manifold for evacuation, back filling, and final sealing. We offer production capability from prototype lots to large production runs utilizing Fredericks single- and multi-station sealing machines. Our consistent success in the manufacture of sturdy, vacuum-tight glass-to-metal seals is the result of a thorough blend of art, science, and experience with proper facilities and controls.

These assemblies are typically used in sophisticated glass products such as:

• Cathode ray tubes

• X-ray tube image intensifiers

• Laser and infrared detectors

• Photo-multipliers

Glass header assemblies are critical components used in the evacuation and getter-firing of electron and power tubes. Fredericks offers a limitless variety of press stems with various diameters and pin configurations.

Glass-to-metal sealing capabilities (or combinations) include these materials:

• Kovar

• Soft Glass

• Tungsten

• Hard Glass

• Sylvania #4

• Pyrex®

• Kulgrid

• Uranium

• Molybdenum

• Nonex

• Titanium