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EF22_9pin

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ID = 31596
       
Country:
Netherlands
Brand: Philips; Eindhoven (tubes international!); Miniwatt
Developer: Philips; Eindhoven (tubes international!); Miniwatt 
Tube type:  HEXODE   RF/IF-Stage   Controlling (mu) 
  Late but no serial production. For instance only development samples. *****
Identical to EF22_9pin
Similar Tubes
Other base:
  EF8
Predecessor Tubes EF8  
Successor Tubes EF22  
Base Loctal-9-Pin (B9G)
Filament Vf 6.3 Volts / If 0.2 Ampere / Indirect / Specified voltage AND current AC/DC
Description Low noise HF preamp tube

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.
 
Text in other languages (may differ)
Information source - - Manufacturers Literature   
ef22_9b_r.png EF22_9pin: original Philips documents
Jacob Roschy

Just Qvigstad 		ef22_9d34.png
EF22_9pin: original Philips documents
Jacob Roschy
More ...

Collection of

Werner Wussow (D)
Jacob Roschy (D)
 
cfh21_9s_r.jpg

EF22_9pin
 
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