Modes of Oscillation in Barkhausen-Kurz Tubes

Experiments are described in which "parasitic" oscillations are elicited, and suppressed, in a generator of the Barkhausen-Kurz type by means of either voltage or circuit adjustments. The performance of tubes of new design employing a straight filament, helical grid, and cylindrical plate cut transversely into three sections is described, and the bearing of the experimental results on the problem of the modes of oscillation of the resonating grid oscillator is indicated. A method of stabilizing frequency by the use of such tubes in conjunction with a tuned transmission line is given.