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C1C

Sensibly equivalent to:
CV1400
    
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A C1C barretter current stabiliser is the most probable identification for this exhibit. The C1C was the Philips C1 fitted with a B4 base.
Barretters were a Continental invention, being used by the Germans to control valve filament currents during WW1.
This specimen looks typically Philips and 1930s.
The wide glass tube envelope is 38 mm in diameter and, excluding the B4 base pins, is 108 mm tall.
References: Datasheet

 

Pin Connections
B4
1
2
3
4
-
-
f
f

 

Absolute Maximum Operating Conditions
Stabiliser
Vh
Ah
120
0.2
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated December24, 2011.
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