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ID = 31605
Brand: Philips; Eindhoven (tubes international!); Miniwatt
Tube type:  Vacuum Pentode   RF/IF-Stage   Controlling (mu) 
  Late but no serial production. For instance only development samples. *****
Identical to DF22_9pin
Similar Tubes
Other base:
First Source (s)
Dec.1939 : Daten und Schaltungen moderner ... Röhren; Philips # 3
Predecessor Tubes KF3  
Successor Tubes 1940   DF22  

Base Loctal-9-Pin (B9G)
Filament Vf 1.4 Volts / If 0.05 Ampere / Direct / Battery =
Information source - - Manufacturers Literature   1940-1941

df21_22_9b_r_1.png DF22_9pin: original Philips documents
Jacob Roschy

Just Qvigstad
DF22_9pin: own collection
Peter den Boer

Collection of



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