Jump to content

866A

From Wikipedia, the free encyclopedia

This is an old revision of this page, as edited by Cydebot (talk | contribs) at 20:21, 3 August 2016 (Robot - Speedily moving category Electrical power conversion to Category:Electric power conversion per CFDS.). The present address (URL) is a permanent link to this revision, which may differ significantly from the current revision.

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

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.

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

References

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