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DK21_9pin

Country:  Netherlands      Brand:  Philips; Eindhoven (tubes international!); Netherlands 
  Developer:  Philips; Eindhoven (tubes international!); Netherlands 
  Tube type:  OCTODE   Frequency converter   Controlling (mu) 
  Late but no serial production. For instance only development samples. *****
Tube ID = 31607
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Identical to DK21_9pin
Similar Tubes Other base:
 DK21
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 = /
Literature - - Manufacturers Literature   

cfh21_9s_r_8.jpg
DK21_9pin: original Philips documents
Jacob Roschy

 
dk21_9b_r.png
DK21_9pin: original Philips documents
Jacob Roschy

 

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