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EF21_9pin

Information - Help 
ID = 19280
       
Country:
Netherlands
Brand: Philips; Eindhoven (tubes international!); Miniwatt
Developer: 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 EF21_9pin
Similar Tubes
Other base:
  EF21 ; EF22
Predecessor Tubes EF9  
Successor Tubes 1941   EF22  

Base Loctal-9-Pin (B9G)
Filament Vf 6.3 Volts / If 0.2 Ampere / Indirect / Parallel / series AC/DC
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. 
Text in other languages (may differ)
Tube prices 1 Tube prices (visible for members only)
Literature - - Manufacturers Literature   
 
ef21_9f_r.jpg
EF21_9pin: original Philips documents
Jacob Roschy

 
ef21_9b_r.png
EF21_9pin: original Philips documents
Jacob Roschy

 
ef21_9d32.png
EF21_9pin: original Philips documents
Jacob Roschy



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