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ID = 31588
Brand: Philips; Eindhoven (tubes international!); Miniwatt
Developer: Philips; Eindhoven (tubes international!); Miniwatt 
Tube type:  Triple Diode-Pentode   Power/Output 
  Late but no serial production. For instance only development samples. *****
Identical to EABL21
Similar Tubes
Other base and data slightly different:
Multiple differences or of other kind:
Predecessor Tubes EBL1  
Successor Tubes 1941   EBL21  

Base Loctal-9-Pin (B9G)
Was used by Radio/TV-reception etc.
Filament Vf 6.3 Volts / If 0.8 Ampere / Indirect / Specified voltage AC/DC

The Philips 21- "Key Base" tubes were initially in 1940 designed with the 9-pin base B9G like the EF50. The later series production from 1942 on however was changed to the 8-pin Locktal-base B8G designed by Sylvania.
Instead of the later EBL21, the EABL21 was planned, containing 3 diodes especially for the then modern 3 diode- detector- circuit.

Text in other languages (may differ)
Information source - - Manufacturers Literature   1940-1941
EABL21: original Philips documents
Jacob Roschy

EABL21: original Philips documents
Jacob Roschy

EABL21: original Philips documents
Jacob Roschy

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