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C2

Sensibly equivalent to:
13U9 TC2
    
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The C2 barretter or current stabiliser was used with heater chains connected directly across the mains supply. The job of the barretter was to keep the heater current steady for fluctuations in the input voltage. In the case of the C2 the control range was 35 to 100 volts.
The filament is held on supports that branch out from a central glass rod.
The iron wire was coiled to allow a considerable length to be housed within the bulb.
Inside the wire can be seen to be held within a fold of the support.
The identification is etched into the dome.
The wide glass tube envelope is 38 mm in diameter, and excluding the Ct8 base pins is 113 mm tall.
Reference: Datasheet. Type C2 was first introduced in 1934.

 

Pin Connections
Ct8
1
2
3
4
5
6
7
8
-
-
-
-
f
-
-
f

 

Absolute Maximum Operating Conditions
Stabiliser
Vh
Ah
100
0.2
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated March 03, 2018.
shape:wide.glass.tube construction:pinch type:barretter age:1930.1940 base:ct8 pins:8 pin:1.- pin:2.- pin:3.- pin:4.- pin:5.f pin:6.- pin:7.- pin:8.f
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