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DCH21_9pin

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ID = 31603
       
Country:
Netherlands
Brand: Philips; Eindhoven (tubes international!); Miniwatt
Developer: Philips; Eindhoven (tubes international!); Miniwatt 
Tube type:  Triode-Hexode   Frequency converter   Controlling (mu) 
  Late but no serial production. For instance only development samples. *****
Identical to DCH21_9pin
Similar Tubes
Other base:
  DCH21
Successor Tubes 1941   DCH21  

Base Loctal-9-Pin (B9G)
Filament Vf 1.4 Volts / If 0.15 Ampere / Direct / Battery =
Description

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 DCH21's with international octal bases.

 
Information source - - Manufacturers Literature   1940-1941

dch21_9b_r.png DCH21_9pin: original Philips documents
Jacob Roschy


Just Qvigstad
dch21data1.png
DCH21_9pin: own collection
Peter den Boer

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Collection of

 
cfh21_9s_r_5.jpg

 

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