866A

The 866 is a mercury vapor half-wave rectifier intended for high-voltage applications. The voltage drop is approximately 15 volts up to 150 Hz. To avoid unwanted shorts the tube must be operated in a vertical position and the filament preheated for at least 30 seconds before applying the plate voltage.[1]

866A
Westinghouse 866A mercury vapor half-wave rectifier tube.
ClassificationDiode
Cathode
Cathode typeDirectly heated
Heater voltage2.5
Heater current5 A
Anode
Max voltage5000
Max current250 mA
References
RCA Transmitting Tube Manual TT-3, 1940

Construction

Structurally, it consists of a linear electrode arrangement; a cup shaped anode with top cap and a cylindrical cathode. The socket is a medium 4 pin bayonet UX-4 and the glass envelope is ST-19. The 2.5 volt/ 5 Amp filament is connected to pins 1 and 4.

Operation

Under normal operating conditions the tube glows blue and mercury droplets are visible.

Pictures in working conditions
  • Westinghouse 866A mercury vapor half-wave rectifier tube. Glowing with 5mA
  • Westinghouse 866A mercury vapor half-wave rectifier tube. Glowing with 5mA in the dark (long exposure)
  • Westinghouse 866A mercury vapor half-wave rectifier tube. Glowing with 180mA in the dark.
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References
  1. "866". www.uli.de.

Further reading
  • RCA Transmitting Tube Manual TT-3. Radio Corporation of America. 1940. pp. 64–65.


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