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ID = 31598
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 CABL21
Similar Tubes
Multiple differences or of other kind:
  EABL21 ; UBL21
Successor Tubes 1941   UBL21  

Base Loctal-9-Pin (B9G)
Was used by Radio/TV-reception etc.
Filament Vf 42 Volts / If 0.2 Ampere / Indirect / Series, ~ = (AC/DC defined current)

The Philips 21- "Key Base" tubes were initially designed in 1940 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 UBL21, the CABL21 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
CABL21: original Philips documents
Jacob Roschy

CABL21: original Philips documents
Jacob Roschy

CABL21: original Philips documents
Jacob Roschy

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