Children: Vacuum tubes
Photomultiplier tube 1970-01-01
Phototube 1970-01-01
Plate detector (radio) 1970-01-01
Plate electrode 1970-01-01
RCA 1970-01-01
RETMA tube designation 1970-01-01
RMA tube designation 1970-01-01
Raytheon 1970-01-01
Russian tube designations 1970-01-01
SY4307A 1970-01-01
Secondary emission 1970-01-01
Selectron tube 1970-01-01
Sovtek 1970-01-01
Space charge 1970-01-01
Suppressor grid 1970-01-01
Sutton tube 1970-01-01
Svetlana (company) 1970-01-01
Sylvania Electric Products 1970-01-01
TM (triode) 1970-01-01
Tetrode 1970-01-01