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ID = 20412
Brand: BBC - Brown Boveri; Switzerland
Tube type:  Half-Wave Mercury-Vapor Rectifier   Power-supply 
Identical to DQ2a
Similar Tubes
Other base:

Base Edison big E27 = 27 mm Top contact with a cap.
Was used by Industrial
Filament Vf 2.5 Volts / If 5 Ampere / Direct
Dimensions (WHD)
incl. pins / tip
51 x 145 x mm / 2.01 x 5.71 x inch
Weight 60 g / 2.12 oz
Information source Universal Vade-Mecum, Electron Valves and Semiconductor Devices   Section 60, p. 81

dq2a_so.png DQ2a: rtt
Anonymous 10 Collector

Just Qvigstad
DQ2a: Electron Tube Handbook 1 BBC
Aldo Patriarca

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