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ID = 8200
United States of America (USA)
Brand: Raytheon Mfg. Co.; Cambridge, MA
Tube type:  Half-Wave Vacuum Rectifier   Power-supply 
Identical to RK21 = 38266A
Similar Tubes
Normally replaceable-slightly different:
  836 ; CV636 ; SS-836 ; VT-236

Base Jumbo 4-pin bayonet (1918) (Codex=Br) Top contact with a cap.
Was used by Transmittertube (Radio)
Filament Vf 2.5 Volts / If 4 Ampere / Half indirect
Dimensions (WHD)
incl. pins / tip
x 164 x 61 mm / x 6.46 x 2.40 inch
Weight 76 g / 2.68 oz
Information source Tube Lore (II)   p. 182 & 219
Tube Lore (I)   
Taschenbuch zum Röhren-Codex 1948/49

rk21_so.png RK21: ARRL Handbook 1972
Anonymous 10 Collector

Just Qvigstad
RK21: Handbook Raytheon amateur tubes
Miguel Angel Trujillo-Rodriguez


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