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ID = 20328
Great Britain (UK)
Brand: Common type Great Britain tube/semicond.
Developer: MO Valve Co. Ltd.; GB 
Tube type:  Transmitting Triode, air cooled 
  <1925 very rare. ***
Identical to VT30 = CV1030 = 10E/8738
Similar Tubes
Normally replaceable-slightly different:
  ET30 ; T250
Differences not known by us:

Base Wires
Was used by Transmittertube (Radio)
Filament Vf 12.5 Volts / If 6.3 Ampere / Direct

250W plate dissipation, 20MHz max operating freq.

Introduced in the early 1920s by MOV as T250, it was accepted by British Post Office as VT30 and by Air Ministry as 10E/8738. Later all the specs were unified in the CV register as CV1030.

Information source -- Original-techn. papers.   

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