Amperex Philips XP2041 Fast Response Photomultiplier Tube 110 mm Hamamatsu R1584
This is an Amperex/Philips XP2041 fast response photomultiplier tube. The XP2041 is a curved face tube, but a metal case and curved plastic lens are included to mate the PMT to a flat surface. Both the lens and the metal case may be removed easily. Amperex/Philips XP2041 is equivalent with Hamamatsu type R1584.