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ID = 31607
Brand: Philips; Eindhoven (tubes international!); Miniwatt
Developer: Philips; Eindhoven (tubes international!); Miniwatt 
Tube type:  OCTODE   Frequency converter   Controlling (mu) 
  Late but no serial production. For instance only development samples. *****
Identical to DK21_9pin
Similar Tubes
Other base:
First Source (s)
Apr.1940 : Philips documents
Successor Tubes 1940   DK21  

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 DK21's with International octal bases.

Literature - - Manufacturers Literature   1940-1941
DK21_9pin: original Philips documents
Jacob Roschy

DK21_9pin: original Philips documents
Jacob Roschy

DK21_9pin: own collection
Peter den Boer

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