in which a standing wave or a considerable part thereof is produced along an electrode, e.g. Clavier tube

Full Title

Transit-time tubes, e.g. Klystrons, travelling-wave tubes, magnetrons > Tubes specially designed to act as oscillator with positive grid and retarding field, e.g. for Barkhausen-Kurz oscillators > in which a standing wave or a considerable part thereof is produced along an electrode, e.g. Clavier tube