Abstract: A streaking or framing image tube includes a photocathode (4), three grid electrodes (1, 2 and 3), a focus electrode (5) and an anode (6) disposed successively along the image tube. The tube is gated by applying a positive voltage pulse first to the second grid electrode (2) and then to the photocathode (4), the delay time between the application of the pulse to the second grid and the photocathode being the gated "on" time of the image tube, while during the application of the pulse to the second grid electrode (2) and the photocathode (4), the potentials of the first and third grid electrodes (1, 3) are held constant at a constant value, and accordingly ultra high speed gating (e.g. allowing the passage of electrons for less than 10.sup.-9 seconds) can be achieved without effect on the magnification or resolution performance of the image tube.

Abstract: A streaking image tube having a suppression mesh electrode spaced between the normally provided accelerating mesh electrode and anode. Appropriate potentials are applied to the electrodes so that undesirable secondary emission from the accelerating mesh electrode is returned to that said electrode.CROSS REFERENCE TO RELATED APPLICATIONSThe above-entitled application is a Rule 60 continuation of Ser. No. 885,192, filed Mar. 10, 1978 and now abandoned; Ser. No. 885,192 being a rule 60 continuation of Ser. No. 599,465 filed July 28, 1975 and now abandoned.