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Phototubes and photomultipliers (old system): nnAA (e.g. 90AV)

two figures followed by two letters

1st figure - tube base 2 Loctal
3 Octal
5 Special
8 B9A
9 B7G
2nd figure is the serial number
1st letter A Caesium-Antimony cathode (blue sensitive)
C Caesium on oxidized silver cathode (red sensitive)
T Tialkali cathode
U Caesium-Antimony cathode with quartz window
2nd letter G gas filled
V high vacuum
3rd letter if present P Photomultiplier

This file was last modified 15:51:42, Tuesday September 02, 2014