At Oak Ridge National Laboratory in Tennessee, a half-dozen workers are making what appear to be gray billiard balls.

Economic considerations, especially the increasing cost of energy, have forced electron power tube designers to revise current designs and to re-examine old ones. One result of this re-examination is ...

TM 11-662 Basic Theory and Application of Electron Tubes 1955-11-08.Introduction 1 1 Importance to communication 2 1 Early experimenters 3 2 Tube types 4 ...