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DF21_9pin

Country:  Netherlands      Brand:  Philips; Eindhoven (tubes international!); Netherlands 
  Developer:  Philips; Eindhoven (tubes international!); Netherlands 
  Tube type:  Vacuum Pentode   RF/IF-Stage   Controlling (mu) 
  Late but no serial production. For instance only development samples. *****
Tube ID = 31604
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Identical to DF21_9pin
Similar Tubes Other base:
 DF21
First Source (s) 1939 : Philips documents
Successor Tubes 1940 DF21  

Base Loctal-9-Pin (B9G)
Filament Vf 1.4 Volts / If: 0.025 Ampere / -: Direct / -: Battery = /
Literature - - Manufacturers Literature   

cfh21_9s_r_6.jpg
DF21_9pin: original Philips documents
Jacob Roschy

 
df21_22_9b_r.png
DF21_9pin: original Philips documents
Jacob Roschy

 

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