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ID = 28077
Great Britain (UK)
Brand: Common type Great Britain tube/semicond.
Tube type:  Thyratron 
Identical to EN91 = PL21 = 2D21 = CV797
Similar Tubes
Other class quality (otherwise equal):
  5727 ; PL5727

Base Miniatur-7-Pin-Base B7G, USA 1940
Filament Vf 6.3 Volts / If 0.6 Ampere / Indirect / Specified voltage AC/DC
Description Tetrode Thyratron.
Va <1300V peak; Ia <500mA pean, 100mA mean. 
Tube prices 1 Tube prices (visible for members only)
Information source - - Manufacturers Literature   
EN91: Own collection
Kazimierz Jarosz

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EN91: ARRL Handbook 1972
Anonymous 10 Collector

EN91: Manufacturer's Literature
Emilio Ciardiello

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