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The differential analyzer is used to give a graphical solution of electron paths in the magnetron and triode oscillators with d.c. and r.f. applied anode potential. A d.c. space charge is approximated in the magnetron; otherwise no space charge is included. The results are of interest in explaining experimental results. In particular, the magnetron paths show a marked tendency towards synchronism, and the triode results indicate that the required peak cathode emission is larger than was supposed.