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90CG

Sensibly equivalent to:
CV2133
    
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Mullard describe the 90CG as a gas filled photo cell, most sensitive to incandescent light sources and to infra-red radiation.
The maximum anode voltage is 90 V and pin four faces the direction of the incident light.
Caesium on oxidised silver is the active material and the cathode effective area is 3 sq cm. The dark current is 0.1 µA and the maximum current is 2 µA.
The curved cathode with rod anode in front.
Front view.
Thanks to Stig Comstedt for sending the data-sheet.
The thin glass tube envelope is 18 mm in diameter and, excluding the B7G base pins, is 47 mm tall.
Reference: Data-sheet. Type 90CG was first introduced in 1955.

 

Pin Connections
B7G
1
2
3
4
5
6
7
-
k
-
a
-
k
-

 

Absolute Maximum Operating Conditions
Light Control
Vh
Ah
Va
-
-
90
PDF scanned from an original document held by the museum
Updated October 08, 2020.
shape:thin.glass.tube construction:all.glass type:photocell age:1950.1960 base:b7g pins:7 pin:1.- pin:2.k pin:3.- pin:4.a pin:5.- pin:6.k pin:7.-
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