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FW4-800

Sensibly equivalent to:
CV31 U20
    
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This rectifier from Mullard is directly heated. The maximum reservoir capacitor is 4 µF and the minimum series resistance has to be 150 Ohms.
The classic envelope is 46 mm in diameter and, excluding the B4 base pins, is 122 mm tall.
References: Datasheet, 3002 & 1043. Type FW4-800 was first introduced in 1948.

 

Pin Connections
B4
1
2
3
4
a(1)
a(2)
f
f

 

Absolute Maximum Operating Conditions
Rectifier
Vh
Ah
Va
mAa
4.0
3.0
850
125
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated January 31, 2013.
shape:classic construction:pinch type:rectifier.fw age:1940.1950 base:b4 heater:4.0v pins:4 pin:1.a(1) pin:2.a(2) pin:3.f pin:4.f
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