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4274A

Sensibly equivalent to:
22S/200A 274A CV1451
    
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The 4274A is a full wave high vacuum rectifier. The filaments are inverted 'v's of coated ribbon.
The anodes from the side. At the top are the filament tension springs.
The filament ribbon can be seen above and below the anode.
The UX4 base pins.
The top of the filament showing the tension springs and fold in the ribbon.
The classic envelope is 51 mm in diameter and, excluding the UX4 base pins, is 119 mm tall.
References: Datasheet, 1040 & 1043.

 

Pin Connections
UX4
1
2
3
4
f+
a(2)
a(1)
f-

 

Absolute Maximum Operating Conditions
Rectifier
Vh
Ah
Va
mAa
5.0
2.0
550
160
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated August 17, 2019.
shape:classic construction:pinch type:rectifier.fw age:1930.1940 base:ux4 heater:5.0v pins:4 pin:1.f+ pin:2.a(2) pin:3.a(1) pin:4.f-
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