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21B

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ID = 84560
       
Country:
Canada
Brand: Canadian Marconi Co. Ltd. (CMC, Esterline), Marconi's Wireless; Montreal, QC
Developer: Canadian Marconi Co. Ltd. (CMC, Esterline), Marconi's Wireless; Montreal, QC 
Tube type:  Triode, vacuum   Power/Output 
Identical to 21B
Similar Tubes
Normally replaceable-slightly different:
  CX371A ; UX171A

Base UX-Base (4 Pins (2 thick, USA 1924, UX)
Was used by Radio/TV-reception etc.
Filament Vf 5 Volts / If 0.25 Ampere / Direct
Dimensions (WHD)
incl. pins / tip
x 108 x 45 mm / x 4.25 x 1.77 inch
Weight 47 g / 1.66 oz
Information source -- Original prospect or advert   Canadian Marconi Co price list July 19, 1939


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