866A
866A | |
---|---|
Classification | Diode |
Cathode | |
Cathode type | Directly heated |
Heater voltage | 2.5 |
Heater current | 5 A |
Anode | |
Max voltage | 5000 |
Max current | 250 mA |
References | |
RCA Transmitting Tube Manual TT-3, 1940 |
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]
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.
References[]
Further reading[]
- RCA Transmitting Tube Manual TT-3. Radio Corporation of America. 1940. pp. 64–65.
External links[]
- Vacuum tubes
- Electric power conversion
- Electronics stubs