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ID = 5821
Developer: RCA (RCA Victor Co. Inc.); New York (NY) 
Tube type:  High Voltage Half-Wave Mercury-Vapor Rec   Power-supply 
Identical to 872A = VT-42A = RK872A = GL872A = 872AX = CE-872A = RK872A = GL872A = WL872A
Similar Tubes
Other shape (e.g. bulb type):
Normally replaceable-slightly different:
  2V/471A ; 319A ; 38172A ; 4064B ; AG872A ; CV642 ; ESU872 ; RCA872A ; VH7400
Other base:
  8008 ; 872G
Multiple differences or of other kind:
First Source (s)
24.Sep.1943 : Electron Tube Registration List
Predecessor Tubes 872  

Base Jumbo 4-pin bayonet (1918) (Codex=Bz) Top contact with a cap.
Was used by Transmittertube (Radio)
Filament Vf 5 Volts / If 7.5 Ampere / Direct / Specified voltage AND current AC/DC

High-voltage mercury-vapor rectifier

Work started on the development of this tube at the RCA laboratories in the summer of 1932. The type number was assigned to it early in 1933 and it was announced in April, 1933. Registered on September 24, 1943. Shielded element structure. T-18 bulb, medium cap (JETEC C1-5) and Jumbo 4-pin bayonet base, JETEC A4-29.

  • 4.75 to 5.25 V filament voltage
  • 7.5 A filament average current, 8 A max
  • 30 s min heating time
  • 10 kV max PIV at Tamb 20º to 60ºC, derated to 5 kV PIV at 70ºC
  • 1.25 A average anode current, 5 A peak

Dimensions (WHD)
incl. pins / tip
x 217 x 58 mm / x 8.54 x 2.28 inch
Weight 225 g / 7.94 oz
Tube prices 4 Tube prices (visible for members only)
Information source Essential Characteristics, GE 1973   
Universal Vade-Mecum, Electron Valves and Semiconductor Devices   Section 66, p. 89 & 90
- - Manufacturers Literature
Taschenbuch zum Röhren-Codex 1948/49
  872A: Vacuum Tube Rectifier
Günter Kudicke
872A: L.N
Lars Nord

More ...
Emilio Ciardiello

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872A: Handbook Raytheon amateur tubes
Miguel Angel Trujillo-Rodriguez

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from Just Qvigstad

Usage in Models 1= 1965?

Quantity of Models at with this tube (valve, valves, valvola, valvole, válvula, lampe):1

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