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DL21_9pin

Information - Help 
ID = 31608
       
Country:
Netherlands
Brand: Philips; Eindhoven (tubes international!); Miniwatt
Developer: Philips; Eindhoven (tubes international!); Miniwatt 
Tube type:  Vacuum Pentode   Power/Output 
  Late but no serial production. For instance only development samples. *****
Identical to DL21_9pin
Similar Tubes
Other base:
  DL21
First Source (s)
Feb.1940 : Philips documents
Successor Tubes 1940   DL21  

Base Loctal-9-Pin (B9G)
Filament Vf 1.4 Volts / If 0.05 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 DL21's with International octal base.

 
Literature - - Manufacturers Literature   1940-1941
 
dl21_9s_r.jpg
DL21_9pin: original Philips documents
Jacob Roschy

 
dl21_9b_r.png
DL21_9pin: original Philips documents
Jacob Roschy

 
dl21_9pin_data.png
DL21_9pin: own collection
Peter den Boer



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