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 |
|
