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DF21_9pin

Information - Help 
ID = 31604
       
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 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 =
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 DF21's with International octal bases.

 
Literature - - Manufacturers Literature   1940-1941
 
cfh21_9s_r_6.jpg
DF21_9pin: original Philips documents
Jacob Roschy

 
df21_22_9b_r.png
DF21_9pin: original Philips documents
Jacob Roschy

 
df21data.png
DF21_9pin: own collection
Peter den Boer



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