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ID = 30674
Great Britain (UK)
Tube type:  Thyratron 
Identical to BT75 = CV489

Base UX-Base (4 Pins (2 thick, USA 1924, UX) 2 Sidecontacts.
Was used by Military and/or Government
Filament Vf 2.5 Volts / If 11 Ampere / Indirect

"Gas Modulator" Filament from side connections.. Base pins (normally filament) 1  cathode (connected to centre of filament); 2 grid;. 3 Anode;  4 screen grid. 

Dimensions (WHD)
incl. pins / tip
77 x 175 x 52 mm / 3.03 x 6.89 x 2.05 inch
Information source -- Original-techn. papers.   
BT75: J.G.
Joachim Glüder


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