P.I. Akimov
All-Russian Electrotechnical Institute (VEI), Moscow, Russia
A.B. Bogoslovskaya
Russian People Friendship University (RUDN), Moscow, Russia
The results of the analysis of amplification of electron current in vacuum and bipolar spherical diodes with plasma boundary in the cathode – anode inverval are given. The opportunity of repeated amplification of a current is shown in comparison with vacuum electron guns and bipolar electron sources with the plasma anode.