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ID = 22087
Brand: Valvo GmbH, Radioröhrenfabrik; Hamburg
Tube type:  Vacuum Pentode   Power/Output 
Identical to EL6/425 = 4699 = EL6spez
Similar Tubes
Normally replaceable-slightly different:
Different maximum ratings:
  EL6 ; EL6/400
Different connections:
Other base:
  EL12/425 ; EL12N ; EL12spez
First year 1938 Tube leaflet collection E.Erb Analysis by original leaflets

Base Europe side contact P8A (Au P, 8SC)
Filament Vf 6.3 Volts / If 1.3 Ampere / Indirect / Specified voltage AC/DC

18 W power output pentode with almost twice the sensitivity as the EL5, intended for applications designed for normal output pentodes as the EL3, but where twice the output power is desired.
Type 4699 is same as EL6/425. A suffix /xxx indicates the max. voltage this tube is especially selected for, otherwise it's 250 V. The EL12 is a parallel type with Y8A base.

Text in other languages (may differ)
Information source Taschenbuch zum Röhren-Codex 1948/49   

au19_g_2.gif EL6/425: RTT Schwandt
Günther Stabe † 19.8.20

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