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ID = 31595
Brand: Philips; Eindhoven (tubes international!); Miniwatt
Developer: Philips; Eindhoven (tubes international!); Miniwatt 
Tube type:  Triode-Heptode   Frequency converter   Controlling (mu) 
  Late but no serial production. For instance only development samples. *****
Identical to ECH21_9pin
Similar Tubes
Other base and data slightly different:
Predecessor Tubes ECH3  
Successor Tubes 1941   ECH21  

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 however was changed in 1942 to the 8-pin Locktal-base B8G designed by Sylvania.
Note the small heater current by 0.2 A compared to the later ECH21 with circa 0,34 A. 
Text in other languages (may differ)
Information source - - Manufacturers Literature   
ECH21_9pin: original Philips documents
Jacob Roschy

ECH21_9pin: original Philips documents
Jacob Roschy

ECH21_9pin: original Philips documents
Jacob Roschy

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