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APV4

Sensibly equivalent to:
1867 1W4-350 CV1039 MU14 R3 R42 UU5
    
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The APV4 is the Tungsram implementation of this very common power rating indirectly-heated full wave HT rectifier. Our other APV4 has a different construction.
One side of the heater is connected to the cathode. The anode cavities are each made from two black pressed plates. This rectifier is designed to work into a maximum reservoir capacitor of 8 µF.
This type of rectifier was used in larger radios from the mid-1930s and remained in the lists until the 1960s.
The image shows both anodes, they are mounted parallel to each other but offset either side of a centre line.
The classic envelope is 45 mm in diameter, and excluding the B4 base pins is 98 mm tall.
References: Datasheet & 1040. Type APV4 was first introduced in 1936.

 

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

 

Absolute Maximum Operating Conditions
Rectifier
Vh
Ah
Va
mAa
4.0
2.3
400
120
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated January 20, 2017.
shape:classic construction:pinch type:rectifier.fw age:1930.1940 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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