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XL601 Hollow Cathode Glow Modulator Tube

XL601 glow modulator tube

XL601 Datasheet .
Normal operation is explained in the datasheet. In the photographs below, the tube is placed in the strong electric field of a coil self-resonating at about 25 MHz. This causes the bulk gas to ionise, allowing us to see its characteristic glow (light emitted on electron-ion recombination). With the cathode pin (3) earthed however, normal ion-bombardment occurs and the hollow cathode emits its intended beam of blue-violet light.

XL601 induction excitation

XL601 glow

See also: Virtual valve museum / XL601



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