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ID = 31608
Brand: Philips; Eindhoven (tubes international!); Miniwatt
Developer: Philips; Eindhoven (tubes international!); Miniwatt 
Tube type:  Vacuum Pentode   Power/Output 
  Late but no serial production. For instance only development samples. *****
Identical to DL21_9pin
Similar Tubes
Other base:
First Source (s)
Feb.1940 : Philips documents
Successor Tubes 1940   DL21  

Base Loctal-9-Pin (B9G)
Filament Vf 1.4 Volts / If 0.05 Ampere / Direct / Battery =

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. There are also DL21's with International octal base.

Information source - - Manufacturers Literature   1940-1941
DL21_9pin: original Philips documents
Jacob Roschy

DL21_9pin: original Philips documents
Jacob Roschy

DL21_9pin: own collection
Peter den Boer

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