Yes we make our tubes here in the United States. Our facility is split into nine manufacturing departments.
1) The machine shop. This is where we create our custom tooling and molds for the facility.
2) The grid department, This is where the grids our wound on original grid winding equipment.
3) The glass department. This where we manufacturer and assemble all glass parts. This includes the stemware, the bulbs, and the drop seals.
4) The parts perpetration department. All parts except for the cathode are washed and atmosphere controlled annealed in this department.
5) The cathode department. The cathodes are prepared in their own department for better quality control.
6) The insulator department. All insulators are prepared in house. In most models of tubes, that involves custom cutting of mica sheets. In the higher power tubes, ceramic is used.
7) The assembly department. This is where the tubes are assembled before drop sealing. This is accomplished in our custom class 10 clean room.
8) The evacuation department. We call the evacuation department, but it is also where we activate the cathodes.
9) Testing department. Aging, stabilizing and testing all happen here.
In addition we have office areas, break room, and shipping and receiving that act as support in the manufacturing of vacuum tubes.
We have taken some time to photograph some of the interesting steps involved in making vacuum tubes. Check back later as we update with more!