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ID = 20764
United States of America (USA)
Brand: Common type USA tube/semicond.
Developer: Philips; Eindhoven (tubes international!); Miniwatt 
Tube type:  Triode, vacuum   SHF/EHF (>3 GHz) 
Identical to 5861 = EC55 = R243
Similar Tubes
Normally replaceable-slightly different:
  DET22 ; DET22D ; DET22E ; DET22R ; DET22S ; TD03-10 ; TD03-10E
First Source (s)
31.Oct.1949 : Electron Tube Registration List rec. 797

Base COAXIAL in general (X..)
Filament Vf 6.3 Volts / If 0.4 Ampere / Half indirect / Specified voltage AC/DC
Description US JEDEC registration for Philips EC55 disc-seal triode. 
Information source Röhren-Taschen-Tabelle, (Franzis RTT)   
5861: PHILIPS 5861
John Albion

More ...
5861: RTT Schwandt
Günther Stabe † 19.8.20

5861: Manufacturer's Literature
Emilio Ciardiello

More ...

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