Puneet Varma (Editor)

866A

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Classification:  Diode
Heater voltage:  2.5
Max voltage:  5000
Cathode type:  Directly heated
Heater current:  5 A
Max current:  250 mA
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.

Contents

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.

References

866A Wikipedia


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