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ID = 20342
Great Britain (UK)
Brand: Common type Great Britain tube/semicond.
Tube type:  Transmitting Triode, air cooled   VHF 
Identical to VT58 = 10E/11405 = E960 = CV1058
Similar Tubes
Normally replaceable-slightly different:
  CV1571 ; VT58A
First Source (s)
1938 : -- Original-techn. papers. Callick
Predecessor Tubes ACT10  
Successor Tubes REL5   CV1098   VT98_GB  

Base TRANSMITTING & Power-TUBES/VALVES in gen Sidecontact and top contact.
Was used by Radar
Filament Vf 12.6 Volts / If 58 Ampere / Direct

Developed in 1938 at GEC by L. le Rossignol, it derived from the ACT10 CAT transmitting triode. It was the first external anode British tube intended for radar transmitters.

Used from 1938 in the 200 MHz transmitter of the CHL system and then in the MB2 ground radar and in the GL1 and GL2 gun laying sets.

  • 750 W anode dissipation, with forced-air cooling
  • 23 kV anode voltage
  • 100 MHz full ratings operating frequency, up to 250 MHz at reduced ratings


VT58: Manufacturer's Literature
Emilio Ciardiello

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