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
Amplificateur lineaire comportant des elements discrets de circuits resonnants et fournissant un rendement presque constant sur une large gamme de puissances de sortie