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DW4/350

Sensibly equivalent to:
1561 442BU 460BU BVA216 CV1796 DW3 R2 R3 R4 R42 RV120/350 U12/14 UU120/350 UU5
    
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The DW4/350 is the Mullard version of this standard rectifier. There is no minimum series resistance quoted and the maximum value of reservoir capacitor is given as 16 μF.
The twin anodes are ribbed for strength and carbonised for efficient heat radiation.
The coated filament is a ribbon as can be seen clearly on the right of this image.
The top mica: the filament tension springs can be seen attached to a pair of central supports. Electrically the filaments are connected in series and so independent top filament support are required.
The classic envelope is 49 mm in diameter, and excluding the B4 base pins is 116 mm tall.
References: 1043 & 1040. Type DW4/350 was first introduced in 1936.

 

Pin Connections
B4
1
2
3
4
a
a
f
f

 

Absolute Maximum Operating Conditions
Rectifier
Vh
Ah
Va
mAa
4.0
2.0
350
120
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated February 11, 2014.
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