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DQ2

Sensibly equivalent to:
866A
    
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The DQ2 is a high voltage half wave mercury vapour rectifier. The 866A is given as an equivalent but that rectifier has a maximum cathode current of 0.5 Amps and the only details found for the DQ2 give a lower figure for cathode current.
The rectifier will produce damaging UV radiation and must be screened.
Brown Boveri and Made in Switzerland on the base cap.
The UX4 base and a view into the cathode cylinder.
The heater/cathode is a wire mesh.
The classic envelope is 50 mm in diameter and, excluding the UX4 base pins, is 136 mm tall.
Reference: Datasheet. Type DQ2 was first introduced in 1938.

 

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
100
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated December19, 2019.
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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