radiomuseum.org

 
Please click your language flag. Bitte Sprachflagge klicken.

DK21_9pin

Information - Help 
ID = 31607
       
Country:
Netherlands
Brand: Philips; Eindhoven (tubes international!); Miniwatt
Developer: Philips; Eindhoven (tubes international!); Miniwatt 
Tube type:  OCTODE   Frequency converter   Controlling (mu) 
  Late but no serial production. For instance only development samples. *****
Identical to DK21_9pin
Similar Tubes
Other base:
  DK21
First Source (s)
Apr.1940 : Philips documents
Successor Tubes 1940   DK21  

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 DK21's with International octal bases.

 
Literature - - Manufacturers Literature   1940-1941
 
cfh21_9s_r_8.jpg
DK21_9pin: original Philips documents
Jacob Roschy

 
dk21_9b_r.png
DK21_9pin: original Philips documents
Jacob Roschy

 
dk21_9pin_data.png
DK21_9pin: own collection
Peter den Boer



You reach this tube or valve page from a search after clicking the "tubes" tab or by clicking a tube on a radio model page. You will find thousands of tubes or valves with interesting links. You even can look up radio models with a certain tube line up. [rmxtube-en]
  
rmXorg