866A
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The 866 is a mercury vapor half-wave rectifier intended for high-voltage applications. The voltage drop is approximately 15volts up to 150Hz. 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.
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.
Further reading
- RCA Transmitting Tube Manual TT-3. Radio Corporation of America. 1940. pp.64–65.