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VT21

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ID = 30732
       
Country:
Great Britain (UK)
Brand: Ediswan, Siemens Edison Swan Electric Co.; London
Developer: Ediswan, Siemens Edison Swan Electric Co.; London 
Tube type:  Half-Wave Vacuum Rectifier   Power-supply 
  <1925 very rare. ***
Identical to VT21 = CV1613
Predecessor Tubes VT19_GPO   VT9B  
Base Wires Wires only.
Was used by Telephony
Filament If 15.5 Ampere / Direct / Specified voltage AC/DC
Description

Double ended glass bulb. 30KV PIV, 0.25A dc current. Filament voltage ranges from 14.5 to 16.5V, exact value marked on each tube. Used in telephony applications at Stonehaven Radio Station by the British post Office. 800 watts output. Only 326 tubes made.
Probably a gridless VT19_GPO.

 
Information source -- Original-techn. papers.   
British Radio Valves - The Vintage Years: 1904-1925   Pages 83 and 133
 
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