HSN code HSN description GST 8540 Thermionic, Cold Cathode Or Photo-Cathode Valves And Tubes (For Example, Vacuum Or Vapour Or Gas Filled Valves And Tubes, Mercury Arc Rectifying Valves And Tubes, Cathode-Ray Tubes, Television Camera Tubes) – Cathode-Ray Television Picture Tubes, Including Video Monitor Cathode-Ray Tubes 18% 854011 Colour 18% 85401110 Thermionic, Cold Cathode Or…