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Teltron maltese cross tube S. High-vacuum electron tube with divergent electron gun aimed at a fluorescent screen partially obscured by a Maltese cross. For demonstrating the linear propagation of electrons in the absence of applied electromagnetic fields by projecting the shadow of a Maltese cross onto the fluorescent screen. Application of a magnetic field using the Helmholtz Coils S allows for students to study the fundamental science of electron optics, such as beam focusing. Maximum filament voltage: 6.3 volts AC. Maximum anode voltage: 5 kilovolt. Anode current: approximate 0.1 milliampere at 4 kilovolt.