Image Diodes
The Image Diode is a proximity focussed diode vacuum photo-tube, otherwise known as a Generation 1 Proximity Image Intensifier.
Image Diodes do not contain Microchannel Plate (MCP) electron multipliers. Instead, light gain is accomplished solely through the acceleration of photoelectrons to roughly 10 keV and the subsequent conversion of the electron energy into light via a phosphor screen. Light gain is typically >10X, and is determined by the photocathode, phosphor and applied voltage.