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866A

Sensibly equivalent to:
2V/400A 3B28 AH201 CV32 CV32 ESU866 GU12 RG3-250A VT-46A
See also:
Westinghouse 866A/866 Box
    
Extras ▼

 

The 866A is a high voltage half wave mercury vapour rectifier. A pair in a full wave configuration feeding a choke input filter can produce 500 mA of DC at 3,000 Volts. Serious power and the rectifiers will produce damaging UV radiation and must be screened.
The base cap carries the Westinghouse name as well as the Type designation of 866A/866 showing that the improved version is suitable for replacing the original design.
The filament is contained within the shielding cylinder. The anode is the plate at the top.
The anode lead is enclosed in a glass tube for most of the length.
The classic envelope is 61 mm in diameter and, excluding the UX4 base pins, is 150 mm tall.
Reference: Datasheet. Type 866A was first introduced in 1952.

 

Pin Connections
UX4
1
2
3
4
tc
f
ic
ic
f
a

 

Absolute Maximum Operating Conditions
Rectifier
Vh
Ah
Va
mAa
2.5
5.0
2650
500
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated August 11, 2017.
shape:classic construction:pinch type:rectifier.mv age:1950.1960 base:ux4 heater:2.5v pins:4 pin:1.f pin:2.ic pin:3.ic pin:4.f pin:tc.a
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