R105 tube equivalent, photomultiplier tube.
28mm (1-1/8 Inch) Diameter Side-on 300 to 650nm Spectral Response High Gain and Low Dark Current Variant of 931A
GENERAL
Parameter Description/Value 300 to 650 Spectral .
Value 300 to 650 Spectral Response 400 Wavelength of Maximum Response Sb-Cs PhotoMaterial 8 × 24 cathode Minimum Useful Size Borosilicate glass Window Material Circular-cage Structure Dynode 9 Number of Stages Direct 4 Anode to Last Dynode Interelect.
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