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ID = 31600
Brand: Philips; Eindhoven (tubes international!); Miniwatt
Developer: Philips; Eindhoven (tubes international!); Miniwatt 
Tube type:  Half-Wave Vacuum Rectifier   Power-supply 
  Late but no serial production. For instance only development samples. *****
Identical to CY21
Predecessor Tubes CY1   CY2  
Successor Tubes 1941   UY21  

Base Loctal-9-Pin (B9G)
Filament Vf 25 Volts / If 0.2 Ampere / Indirect / Series, AC/DC

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   
CY21: original Philips documents
Jacob Roschy

CY21: original Philips documents
Jacob Roschy

CY21: original Philips documents
Jacob Roschy

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