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Three types of storage tube, all employing the same storage structure, consisting of a fine metal mesh coated with a dielectric film on the side facing the writing gun are featured by Cathodeon. In the C990 (with magnetic writing and read-out guns) and C992 (electrostatic writing and magnetic read-out) tubes the read-out gun is based on a standard 3in image orthicon gun and operates in standard image orthicon coils, and the output signal can be taken from the electron multiplier as in an image orthicon. In the C991 both guns are high-resolution all electrostatic and no electron multiplier is incorporated, and the output signal is taken from the collector mesh.
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