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Information - Help 
ID = 29271
Great Britain (UK)
Brand: Common type Great Britain tube/semicond.
Tube type:  Thyratron 
Identical to XH3-045 = FX227 = CV372 = BT79 = 3C45

Base UX-Base (4 Pins (2 thick, USA 1924, UX) Top contact with a cap.
Filament Vf 6.3 Volts / If 2.5 Ampere / Indirect / Specified voltage AC/DC
Description Hydrogen Thyratron
Va <3kV, 40A peak. Ia <50mA mean 
Dimensions (WHD)
incl. pins / tip
40 x 132 x mm / 1.57 x 5.20 x inch
Information source - - Manufacturers Literature   

xh3045_so.png XH3-045: ARRL Handbook 1972
Anonymous 10 Collector

Just Qvigstad
XH3-045: Mullard-original papers
Otto Galli

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