Before revision: Operation Schematic diagram of a magic eye indicator tube: a = anode, k = cathode, g = grid, b = deflection A magic eye tube is a miniature cathode ray tube, usually with a built-in triode signal amplifier.
After revision: Method of operation Schematic diagram of a magic eye indicator tube: a = anode, k = cathode, g = grid, b = deflection A magic eye tube is a miniature cathode ray tube, usually with a built-in triode signal amplifier.