... side-on photomultiplier tubes, borosilicate glass, double-alkali photocathode Diameter of 28.5mm(1.12 inch), nine stage, side-on ... photomultiplier tubes, borosilicate glass, double-alkali photocathode Features: Diameter of 28.5mm(1.12 inch), nine stage, side-on ... Bule Sensitivity Index--Red Sensitivity Index--Gain3x105Pulse rise time4ns Diameter of 28.5mm(1.12 inch), nine stage, side-on ...