H01J21/06—Tubes with a single discharge path having electrostatic control means only
H01J21/10—Tubes with a single discharge path having electrostatic control means only with one or more immovable internal control electrodes, e.g. triode, pentode, octode
H01J21/14—Tubes with means for concentrating the electron stream, e.g. beam tetrode
Elektronenvervielfacher-Halbleiterantikathode-Bildaufnahmevorrichtung mit lichtempfindlicher oder elektronenemittierender Flaeche,sowie solche mit einer solchen Antikathode