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The type number consists of two figures followed by two letters (e.g. 90AV).
First figure (tube base)
2 - Loctal 8-pin base
3 - Octal 8-pin base
5 - Special base
8 - Noval 9-pin base
9 - Miniature 7-pin base
Second figure (serial number)
First letter (type of cathode)
A - Caesium-antimony cathode (blue-sensitive)
C - Caesium on oxidised silver cathode (red-sensitive)
T - Tialkali cathode
U - Caesium-antimony cathode with quartz window
Second letter (class of phototube)
G - Gas-filled
V - High vacuum
Third letter (always P for photomultiplier).
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