GENERAL FEATURES Parameter Description/Value Unit Spectral Response Wavelength of Maximum Response Photocathode Window Material Dynode Direct Interelectrode Capacitances Base Suitable Socket nm nm — mm — — — pF pF — — 300 to 650 400 Sb-Cs 8 × 24 Borosilicate glass Circular-cage 9 4 6 JEDEC No. B11-88 E678-11A Material Minimum Useful Size Structure Number of Stages Anode to Last Dynode Anode to All Other Electrodes