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Sensibly equivalent to:
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The 2G is a Barretter or current stabiliser. Iron wire in a hydrogen atmosphere forms the active element. When inserted in series with a 100 mA heater chain it can maintain the heater current sensibly constant for variations in the mains voltage between 5 and 40 Volts.
Baretters cannot be connected directly across a voltage source.
Inside the envelope are two separate wire loops. One loop connects to pins 1 and 4 and the other to pins 2 and 3.
The wire loop is made from coiled wire. Each loop has a cold resistance of 30 Ohms.
The wide glass tube envelope is 26 mm in diameter, and excluding the base pins is 83 mm tall.
Reference: Observation.


Absolute Maximum Operating Conditions
Updated October 12, 2018.
shape:wide.glass.tube construction:pinch type:barretter base: pins:4 pin:
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