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ID = 20848
Great Britain (UK)
Brand: MO Valve Co. Ltd.; GB
Tube type:  Triode, vacuum   UHF 
Identical to DET22 = EC55 = CV273
Similar Tubes
Normally replaceable-slightly different:
  5861 ; A2327 ; DET22D ; DET22E ; DET22R ; DET22S ; TD03-10 ; TD03-10E
Other characteristic (electr. data):

Base SPECIAL TUBEBASE in general
Filament Vf 6.3 Volts / If 0.4 Ampere / Indirect / Specified voltage AC/DC
Description Disc Seal Conduction-cooled UHF tube for operation up to 1 GHz at 4W and up to 3GHz at reduced rating and useful to 3.7 GHz
"The DET was one of the earliest and smallest of the disc seal triodes ... the valve was near the ultimate in mechanical precision with anode-cathode gap of only 0.07mm with a tolerance of 0.002mm."

Also available with suffices D. E, R and S with controlled characteristics. 
Information source Röhren-Taschen-Tabelle, (Franzis RTT)   
- - Manufacturers Literature   
DET22: Private collection
Emilio Ciardiello

More ...
DET22: RTT Schwandt
Günther Stabe † 19.8.20

DET22: data sheet marconi wireless telegraph company
Antonio Bordini

More ...

Usage in Models 2= 1960??

Quantity of Models at with this tube (valve, valves, valvola, valvole, válvula, lampe):2

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