Tubes
|
Vacuum Tubes |
Military |
| Acrian | Lansdale | Ratheon |
| Amperex | Litton | Samsung |
| Amperite | Machlett | Semicon |
| Burroughs | Matsushita | Siemens |
| Cetron | Microwave Assoc. | Stantel |
| Dumont | Motorola | Sylvania |
| EEV | Mullard | Telefunken |
| E.G. & G. | National | Thomson-CSF |
| Eimac | NJRC | Toshiba |
| General Electric | Omniwave | Varian |
| Genalex | Panasonic | Vicon |
| Hitachi | Philips | Victoreen |
| ITT | Plessey | Westinghouse |
| Jennings | RCA |