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ID = 30611
Great Britain (UK)
Brand: Osram-Valves GB (not MO-Valves)
Tube type:  Half-Wave Mercury-Vapor Rectifier   Power-supply 
  Ca. 1925 up to 1945 rare.
Identical to GU1 = VT138_GPO = CV1623 = RG1/250
Similar Tubes
Normally replaceable-slightly different:
Different maximum ratings:
Successor Tubes GU50  

Base Europe 4-Pin B4 (Eu A, E, 4A) 1914
Was used by Industrial
Filament Vf 4 Volts / If 3 Ampere / Direct / Specified voltage AC/DC

Va<1kV and Ia<250mA mean with 30s delayed application of HT.

Information source - - Manufacturers Literature   Osram wireless guide, 1931
Babani, International Radio Tube Encyclopaedia   Pages 278 & 279
Universal Vade-Mecum, Electron Valves and Semiconductor Devices
  GU1: Internet
Miguel Angel Trujillo-Rodriguez
GU1: Sammlung
Anonymous 557 Collector

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GU1: rtt
Anonymous 10 Collector

GU1: Osram wireless guide, 1931
Anonymous 15 Collector

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from Just Qvigstad

Usage in Models 1= 1932

Quantity of Models at with this tube (valve, valves, valvola, valvole, válvula, lampe):1

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