| 866A |
Westinghouse 866A mercury vapor half-wave rectifier tube. |
| Classification: |
Diode |
| Cathode |
| Cathode type: |
Directly heated |
| Heater voltage: |
2.5 |
| Heater current: |
5 A |
| Anode |
| Max voltage: |
5000 |
| Max current: |
250 mA |
| Reference |
| 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.
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 and the glass envelope is ST-19. The filament is connected to pins 1 and 4.
Under normal operating conditions the tube glows blue and mercury droplets are visible.
[edit] Pictures in working conditions
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Westinghouse 866A mercury vapor half-wave rectifier tube. Glowing with 5mA
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Westinghouse 866A mercury vapor half-wave rectifier tube. Glowing with 5mA in the dark (long exposure)
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Westinghouse 866A mercury vapor half-wave rectifier tube. Glowing with 180mA in the dark.
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[edit] References
- RCA Transmitting Tube Manual TT-3. Radio Corporation of America. 1940. pp. 64–65.
[edit] External links
