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ID = 37042
Great Britain (UK)
Brand: Ferranti, GB
Tube type:  Thyratron Cold-cathode 
Identical to GK41
Similar Tubes
Other base and other heater:

Base Wires
Filament --/-- / --/--
Description Triode Ia <20mA peak, 5mA mean; Trigger voltage 79-85. 
Information source - - Manufacturers Literature   
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